Rental Car Center 2200 Rental Car Center Parkway, College Park, GA 30337, United States of America. Find the best price for SIXT car rentals in Porto airport (OPO) or book a car in other airports of Portugal. The minimum age to rent a car is 19, with a driver’s license held for 1 year. SIXT’s Podgorica Airport car rental services offer top-tier vehicles and extras to make your trip a smooth one. We offer convenient locations such as airports, train stations, cruise ports, and hotels, where you can get great car rental. Special Offers. Once at the Rental Car Center please take the ramp to the 3rd level and follow signs to the SIXT car return area. Get a great deal on top quality car hire at our Porto Airport branch! SIXT rent a car offers fantastic customer service and low prices on a wide range of vehicles!Sixt Car Hire in Porto Airport (OPO), Portugal With a Sixt branch conveniently located at Porto Airport, you can pick up your car hire when you step off the plane and begin your. For business travelers visiting Cairo, a small sedan makes a cost-efficient choice. Compact, Crossover. Our diverse fleet of premium cars includes luxury and economy options like SUVs, convertibles, passenger vans, and minivans. Choose from our compact cars and sedans, sports cars and convertibles, SUVs. Address. View deals. The free shuttle then took us to the. 1. Our professional staff will be ready to assist you with the check-in. $22 - $47. 01. Check our search engine to find the best price for your car rental at Porto Airport (OPO)! Good to know when renting at Porto Zona Industrial. Sixt staff can be contacted by phone on +351 255 788 199 or by email at reservations@sixt. Our branch is conveniently located in the Airport Rental Car Center. Charlotte Airport Car Rental Pick-up and Drop-off. Some car categories have a higher minimum rental age, and an underage driver fee may apply. To find our rental car counter in Ljubljana Airport (LJU), go to the ground floor of the main parking garage that is located across from the main terminal in the primary airport building. FLL Car Rental Center 600 Terminal Dr, Fort Lauderdale, FL 33315-3618, USARent a car in Oman from SIXT and find competitive rates for a variety of vehicle categories. Travel in a safe and stylish vehicle by booking a San Antonio car rental with SIXT. Enhance your. Get around the city in style when you rent a car with SIXT at Porto Airport. You need to be at least 21 to rent a car with SIXT in the US. Out of hours. 5 /10 Budget Car Rental Porto Airport 8. Just came back from Lisbon and rented a car from portugal-auto-rentals. 7. The vehicle selection is diverse, offering a range from economy to luxury cars. When it comes to car rentals, we understand that affordability is key. Let Sixt be your top choice when it comes to car rental at Madeira Airport. Plus, you can customize your rent a car with extras like GPS. Our large fleet is made up of premium vehicles at affordable prices, so you’ll have no problem. * The prices were calculated on 17. 01. First off, head over to our website and find your way to the booking section. 8. With your rental car, take a trip to see the beautiful Geelong waterfront. In the last 72 hours the cheapest rental car price was found at Klass Wagen R. Write a review. They had the lowest prices online so we thought why not give them a chance. You must be at least 21 with a license held for 1 year or more to rent a car with SIXT in Puerto Rico. Find our car rental branches in all major cities at home and abroad. These services are : Short Term Rental-Self Drive. 29. Extras such as GPS, child seats, etc. January. 4 /10 Hertz Car Rental Porto Airport 8. We offer a selection of economy cars, sedans, SUVs, convertibles, minivans, luxury cars and more. Today we are present in over 105 countries with branches in over 2,200 locations. We offer flexible hours, which means we are available when you need us. Address. Remember to take your personal belongings with you. Get around the city in style when you rent a car with SIXT at Porto Airport. Latest prices: Economy $5/day. Please note: nobody would have been able to spot this damage. reservations@sixt. A SIXT shuttle will be waiting for you outside the terminal to take you to our branch. At the time of writing this, there are six car rental companies who have offices situated at Porto Airport: Avis, Budget, Europcar, Hertz, National/Alamo and Sixt. More information. Good to know when renting in Lisbon. Sixt offers affordable car rental at Azores Santa Maria Airport. You can even get a one-day rental if that’s all you need. Whether you’re visiting for business or pleasure, a Tivat Airport car rental gets you around in style and comfort. The price is 32% lower than the rest of the year at just $22 per day. Porto Tourism Porto Hotels Porto Bed and Breakfast Porto Vacation Rentals Flights to Porto Porto Restaurants Things to Do in Porto Porto Travel Forum Porto Photos Porto Map Porto Travel Guide All Porto Hotels; Porto Hotel Deals; Last Minute Hotels in PortoPorto Car Rental SIXT makes the drive as enjoyable as the destination Choose from Luxury Cars, SUVs, Convertibles, Minivans & more! Rent. RENTAL CAR CENTER 3355 Admiral Boland Way, San Diego, CA 92101-1100, United States of America. It is located 6. Address. The streamlined process, from online booking to vehicle pickup, is commendable. We give you the option of hiring a vehicle for anything from a weekly rental to a much longer period. Working hours. Our friendly customer service agents will help you with every step of the rental process. We offer an extensive fleet of premium rental cars at affordable rates. Compact C$ 11/day. Port Elizabeth Airport car rental. To reach our branch, simply take one of the shuttles, marked Rental Car Shuttle, that depart from the terminals. 9 /10 Sixt Car Rental Porto Airport 8. General Information: Francisco Sá Carneiro Airport or simply Porto Airport is an international airport near Porto, Portugal. How much does it cost to rent a car from SIXT in Porto Airport? Average SIXT rent a car prices are around $28 per day and $148 per week. Book online from the comfort of your own home and select your ideal choice from our extensive range of cars. Choose from car categories including sedans, economy cars, SUVs, vans and pickup trucks. Sixt Car rental in Vila-Do-Porto Airport. Compact $5/day. When you arrange your Ballina Airport car hire through us, we can also automatically help you manage your toll road use through our partner, Linkt!Just came back from Lisbon and rented a car from portugal-auto-rentals. At SIXT you can either pay online or when you pick up your car in Puerto Montt Airport. Enjoy the stunning Portuguese island of Santa Maria and Vila do Porto with a Rent a Car and see the sights like never before. We are in the arrivals hall building, just outside the terminal. Car rental under 25 in San Diego. Our recommendation is to book your car in advance, as rates online are better than directly renting a car at the Airport. One-way car rental in West Palm Beach. Our wide-ranging fleet offers something for everyone, whether you need an economy car or spacious SUV. Have a convenient way to get around the city just after arriving, with a Bucharest Airport car rental from SIXT. The most popular car rental model at Porto Airport (OPO), Portugal is the Citroen C3. At SIXT, we provide a seamless car rental experience at Chicago O'Hare Airport. If you’re planning a tour of Portugal, consider a Porto car rental from SIXT for a comfortable and convenient trip. Additionally, you’re welcome to customize. Search for the best prices for Sixt car rentals in Porto. SUVs and vans are perfect for families, while our sleek sedans and compact cars. You will be able to easily find SIXT car rental services internationally in almost every major city and tourist destination worldwide. Car rental under 25 in Puerto Rico. Booking a Lisbon airport car rental is effortless, thanks to SIXT. SIXT has special deals for cars, trucks, utes, vans and mini-buses in Portugal Metro and regional locations to choose from - book online, rent a car and save now. Sixt Rent a Car no Aeroporto de Porto, OPO, Portugal | RentcarsSIXT's Location at Orlando International Airport. Car rental location Porto Airport. me and my girlfriend rented a car from sixt for the second leg of our Portugal trip from the Porto Airport location. Looking for car rentals in Lisbon? Search prices from Centauro, Europcar, National, Sixt, Thrifty and keddy by Europcar. The best deals Exclusive discounts. More information. Close. You can add additional drivers to your booking as an optional extra. Choose from economy cars, sports cars, passenger vans, luxury cars, station wagons and SUVs for your Porto Airport car rental, all at competitive rates. Car rental at Porto Airport Off-Terminal. To pick up your rent a car in Porto, take the road to Rotunda da Boavista. Luxury Car Hire. When I got to the desk the employee tried to make me purchase extra damage insurance. A few things to remember at the end of your car rental, such as refueling a car and inspecting for damage. You’ll always get friendly service from our English-speaking rental agents and 24/7 customer service. When you book a Cancun Airport car rental with SIXT, you can rest assured that you will be provided with a reliable and budget-friendly vehicle that you can use to travel throughout the area. To make sure your rental meets all your requirements tailor your rent a car with our deals on add-ons. Car rental under 25 in Madrid. SIXT. Economy $5/day. Services such as e. Car Rental at Private Airport Barcelona Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs, convertibles, luxury cars & passenger vans. When looking for Mykonos Airport car rental, you can count on SIXT. We also have electric cars in Porto. Convertible C$ 42/day. Whether you're traveling with family and need the spaciousness of a minivan or SUV with generous cargo capacity, or you prefer. Klass Wagen, Sixt, SURPRICE CAR RENTAL , GREEN MOTION , Dollar: Cheap car hire in Porto. You will be able to easily find SIXT car rental services internationally in almost every major city and tourist destination worldwide. Upon touching down at PFO, you'll find a rental car counter right in the terminal building. If you’re traveling with friends or family, book a seven-seater SUV for a night out or a game at American Airlines Arena. Before Security 07:00 - 24:00 +351 222076725. Some car categories have a higher minimum age for rental. Choose from car types ranging from luxury sedans to compact cars, and passenger vans to station wagons that cater to passenger sizes and styles. Luxury $32/day. One-way car rental in Portugal. To rent a car with SIXT at Porto Airport Off-Terminal you need to be at least 19 with a valid license. Our car rental deals in Seattle-Tacoma Intl. Also read 35 reviews of Sixt at San Jose Airport. IATA Code: OPO. Out of hours. As well as budget cars, our fleet contains luxury brands, convertibles, 4x4s and more. Full-size $32/day. One-way car rental in Budapest. You can rent a car easily from SIXT’s San Juan Airport location. Choose from a variety of car categories including minivans, sedans, luxury models, SUVs and even electric vehicles. Driving out of state. Car Rental at Porto Airport Off-Terminal Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs,. com, so it went quick. 36 reviews. We are easy to find on the left side of the arrivals hall just before you exit the building. Plus, you can customize your rent a car with extras like GPS. Rent a car in Santander with SIXT to cruise the capital of the Cantabrian region of Spain in a premium vehicle. Our fleet offers something for every budget and group size. Electric Car Hire. Podgorica Airport Car Rental. To rent a car with SIXT at Porto Airport Off-Terminal you need to be at least 19 with a valid license. The Chrysler Pacifica Rental: Spacious and Effective Impressive Performance: Whether heading out to the country or cruising the city the Pacifica gives you powerful. Select from our useful add-ons like child seats, GPS and additional drivers to customize. Upon your arrival at CLT, simply exit the baggage claim and arrivals area of the terminal building's lower level. Compact $5/day. SIXT services in Porto. 5. Rent a car with Sixt for your trip to the beautiful Portuguese city of Faro and you will soon discover how easy it is to book a rented vehicle. This SIXT branch is conveniently located inside the airport terminal and offers a 24-hour return service to cater to all flight times. Small cars. With a Sixt branch conveniently located at Porto Airport, you can pick up your car hire when you step off the plane and begin your trip instantly. SIXT rates fluctuate from $7 to $124 per day and from $37 to $659 per week in Porto OPO Airport. Then head to the largest palace in Western Europe: Palacio Real. Car rental. Cape Town International Airport (CPT) is the second busiest airport in South Africa and the third busiest in Africa. A real treat for history fans, the old town is a UNESCO world heritage site, though thanks to the University which was founded in the 16th century, the city. Bucharest Airport car rental. Save. With regards to the Wikipedia article over Porto Airport, the airport has one take-off and landing runway. Rent a car with Sixt for your trip to the beautiful Portuguese city of Faro and you will soon discover how easy it is to book a rented vehicle. * The prices were calculated on 17. The dark pictures are inconclusive. Zagreb Airport Car Rental. Sixt. Compare from agencies. Search for cheap car rental deals in Porto. Located in the town of Lucciana, Corsica Bastia Airport sits just outside of Bastia and it generally takes about 30 minutes to reach the city center. We offer car categories for every type of traveler, including SUVs, sedans, luxury vehicles, and minivans. In general, it is allowed to rent a car from the age of 19 in Portugal, with a license held for at least 1 year. When you book a Toronto Pearson Airport car rental through SIXT, you can be confident that you will receive a premium vehicle at a great price. Full-size C$ 68/day. com!Terminal rental counter and pick-up. Returning your rental car at Los Angeles Airport (LAX) is a breeze with the SIXT 24/7 return kiosk. Choose from economy cars, sports cars, passenger vans, luxury cars, station wagons and SUVs for your Porto Airport car rental, all at competitive rates. pt - Bookings for Faro Airport - faropark@ana. Intermediate $7/day. Our fleet of vehicles is an average of 3 months old and provides luxury travel at an affordable price. Our recommendation is to book your car in advance, as rates online are better than directly renting a car at the Airport. Intermediate £4/day. First to Review. Our rental model options include economy and luxury cars, convertibles, SUVs, passenger vans, minivans and more. Companies like Hertz, Sixt, or Europcar are housed here and, for travelers who book in advance, the car will be provided in front of the airport. Some car categories have a higher minimum rental age, and an underage driver fee may apply. Car Rental at Porto Airport Off-Terminal Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs,. 00 am to midnight every day. Comfort Have your rental car waiting just outside the terminal. Our fleet has models for every type of traveler, with some options including SUVs, pick-up trucks, sedans, luxury cars, and passenger vans. Economy $5/day. Car Rental at Madrid Airport T4 Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs, convertibles, luxury cars & passenger vans. You can even get a one-day rental if that’s all you need. When you rent a car in Stuttgart you have a full range to choose from including compact vehicles for city driving, luxury convertibles, and sports cars or spacious and rugged SUVs. More information. If you want to save a little money on your rental, select one of our sedans. Car rental partner Sixt offers car rental services for all passengers visiting Porto Airport (OPO). Intermediate $7/day. Full-size C$ 61/day. Sixt car rental at Porto Airport is open from 7. An underage fee applies. 1 /10 Sixt Car Rentals at OPO; Avis car rentals near Porto Airport. 2023. Nashville Airport car rental. 57 per rental. Porto Airport. One Key members save 10% or more on select hotels, cars, activities and vacation rentals. Pick Up information: After leaving the arrival area please keep right and follow the signs to the car rental area where you will find our Sixt counter on the left side. Pick-up out of opening hours is possible for an additional charge. Car Rental at Porto Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs, convertibles, luxury cars & passenger vansSIXT car rental is currently operating at T1 International Terminal only. Choose from economy cars, sports cars, passenger vans, luxury cars, station wagons and SUVs for. Choose a few bookable extras to customize your. Sixt car rental fleet in Porto Airport OPO. Our Short Term Car Rental Service is available on daily, weekly and monthly Rental basis (from one day to maximum of 1 year period) with services that serve all the needs of customers. Select from our useful add-ons like child seats, GPS and additional drivers to customize your rental. All Car Types. Car Rental at Porto North Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs, convertibles, luxury cars & passenger vans. First and last time I rent a vehicle with Sixt. Some car categories have a higher minimum rental age, and an underage driver fee may. To rent a car with SIXT at Porto Airport Off-Terminal you need to be at least 19 with a valid license. pt. Compact C$ 7/day. 4 seats. Park & lock the car. Choose from a variety of car brands: saloons, economy, compact cars, as well as convertible, sports or luxury models. com!. Our prices fluctuate. Our Sixt shuttle will bring you to the airport car park, approximately a 2 minute bus ride from the airport. What's the minimum age to rent a car at Porto Zona Industrial? To rent a car with SIXT at Porto Zona Industrial you need to be at least 19 with a valid license. Full-size $35/day. Keep in mind that mini, economy and compact models fall into the lower price range. Book a car rental in France with SIXT and enjoy a variety of extras including GPS, an additional driver and child seats. Get around the city in style when you rent a car with SIXT at Porto Airport. Our branch is conveniently located in the Airport Rental Car Center. Address. 36 reviews. She told me I would be refunded within 48 hours and now a month later I still haven't been. Book your car hire in Porto at least 1 day before your trip in order to get a below-average price. Enterprise Car Rental Porto Airport 9. Compare car suppliers to unlock big savings, and package your flight, hotel, and car to save even more. Rent a car in Porto and get the chance to get around this historic city. 57 excluding VAT per day for all groups up to a maximum of EUR 83. , will be added to the final price at the end of the booking process. Our car rental services at Las Vegas airport provide you with a wide range of rental cars, including luxury brands like BMW and Audi, so you can cruise down Las Vegas Boulevard in ultimate style. In Tampa, SIXT provides impressive options for vehicles, bookable extras, and rental periods. The affordable rates offered on our premium fleet give you a convenient way to continue your travels in southwestern France. Whatever your arrival plan, SIXT allows you to rent a car in Denver seamlessly and explore the city's offerings. I drove only on the highway, with one stop to refuel. A small car rental is typically 67% less expensive than the average. Office hours. Luxury $42/day. You can add additional drivers to your booking as an optional extra. Porto Montenegro is a must-visit when in Tivat for stunning views of the ocean and a taste of the local cuisine. Upgrade your experience with add-ons like unlimited mileage deals and LDW, child seats, GPS or an. Space for 2 bags. When you rent a car in Poland from SIXT, you can be guaranteed the highest standards of vehicle, whether you opt for a luxury sedan or economy city car. Rental car pickups all too often happen when you're hardly feeling your best. Good 7. Search for the best prices for Sixt car rentals in Porto. Car rental companies reserve the right to refuse service to underage or unlicensed drivers, those with poor credit history or individuals otherwise considered liabilities by the rental company. Student discount. Rent a car at our branch and enjoy the wide range of vehicles we offer from SUV to. After collecting your bags, exit the terminal building and follow the signs to Sector B Long Term Parking which is in front of the terminal. Car Rental at Porto Airport Off-Terminal Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs,. SIXT’s Sibiu Airport car rental counter is conveniently located and gives you easy access to the city and region. You can explore as much as you want, as all our rentals. What documents do I need to hire a car at Porto Airport Off-Terminal? You need a valid driver’s license held for at least 1 year, depending on the car category. I did not cause it. To pick up your rent a car in Porto, take the road to Rotunda da Boavista. You can return your car to the branch parking lot. Drop-off is at the departure parking area where a SIXT employee will help with the return procedure. With an affordable means of travel you can see and do more. Our premium fleet in Las Vegas Mccarran Airport is made up of top car brands such as Nissan, Toyota and Chevrolet. When planning a visit to the Mile-High City, incorporate SIXT into your Denver car rental arrangements. Bucharest Airport car rental. Van Rental in Porto. Real reviews. Sixt Services at Porto Airport With a Sixt branch conveniently located at Porto Airport, you can pick up your car hire when you step off the plane and begin your trip instantly. Our car categories include standard and premium sedans, compact cars, SUVs and more. $67 - $134. Find the best price for SIXT car rentals in Porto Downtown or book a car in other locations around Porto. Upgrade your experience with add-ons like unlimited mileage deals and LDW, child seats, GPS or an. They claim alleged damages during a 3 hour rental from Lisbon Airport to Faro Airport. Payment can only be made with a major credit card. Documents you need to rent a car in Puerto Rico. Compare car suppliers to unlock big savings, and package your flight, hotel, and car to save even more. Our fleet features compact and standard sedans, SUVs and passenger vans for larger groups. You must be at least 21 with a license held for 1 year or more to rent a car with SIXT in Puerto Rico. Choosing the length of your car hire in Porto is flexible. Our SIXT counter is located within the airport terminal, ensuring easy access and a seamless start to your journey. Car hire in San Francisco is ideal for families as we also provide minibuses. The scratch is underneath the front bumper, very difficult to see. The pickup in Lisbon was friendly -. Driving out of the country. SIXT's location at Ljubljana Airport. Book online today with the world's biggest online car rental service. 53 with GreenMotion. 6 years ago. One Key members save 10% or more on select hotels, cars, activities and vacation rentals. Compact £6/day. limousine service and delivery or collection of a car outside of. Opening times not available. We offer flexible hours, which means we are available when you need us. Our branches are conveniently located across the city, our car rental station at the Fort Lauderdale airport, Downton, or near the beach. Full-size $37/day. 3 / 153 reviews. Easily book a long-term rental at Porto Airport Off-Terminal by entering trip dates and pick-up/drop-off locations. Latest prices: Economy C$ 7/day. 62 /day. 7/17/2015. 9. Car Rental at Jacksonville Airport Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs, convertibles,. We offer economy cars, SUVs, sedans and passenger vans to accommodate however many people you are. Re: SIXT car rental. 04/day * SUV Renault Captur or similar Starting at £9. Directions to desk. Some car categories have a higher minimum age, and an underage driver fee applies to those under 25. As you head down this road, you will notice the bright orange SIXT signage, about 500 meters from Casa da Música. Rental Car Center 10991 Terminal Access Road, Fort Myers, FL 33913-7600, United States of America. Sixt Car Rentals at Porto Airport from $7/day - KAYAK Flights Hotels Cars Travel Guides Vacation Rentals Direct Best Time to Travel NEW Explore Trips KAYAK for Business. Porto Tourism Porto Hotels Bed and Breakfast Porto Porto Holiday Rentals Porto Holiday Packages Flights to Porto Porto Restaurants Porto Attractions Porto Travel Forum Porto Photos Porto Map Porto Guide All Porto Hotels; Porto Hotel Deals; Last Minute Hotels in. Please call us 24 hours in advance at +351 919 427 754 to arrange return time and location. Drive a premium vehicle at a competitive rate when you choose SIXT rent a car in Portugal. The return address is the same, and. Economy £5/day. For more information please contact Drive on Holidays on +351 962 247 403. To rent a car with SIXT at Porto Airport Off-Terminal you need to be at least 19 with a valid license. What is the average car rental daily rate at Porto Airport (OPO), Portugal? In the last 30 days, the average daily rate was US$ 46. 4. Can I modify, extend, or cancel my reservation?Other suppliers at Porto Airport. The minimum age to rent a car with SIXT in the US is 21. Customers looking for car rental from Rhodium will find Goldcar supplies the fleet. All car rental companies operating at Houston Airport can be found at the IAH Rental Car Center. 0/10). 62 /day. We have convenient locations in Terminals 2 and 3 at the airport and we offer 24-hour service. With our SIXT Madrid Barajas Airport car rental services, it’s easy to fully explore the city. Write a review. However, some car categories require renters to be 25. Latest prices: Economy £4/day. Upon your arrival, simply follow the signs directing you to the rental car area. Date of experience: 24 October 2023Rent a car in Oman from SIXT and find competitive rates for a variety of vehicle categories. An additional fee may apply. Excellent. We have a great selection of economy cars and sedans for you to choose from that meet the needs of both business travelers and families. In the last 72 hours the cheapest rental car price was found at Europcar Rua Eng Jorge Anjinho Lote 6 N139 3030-329 (1 miles from city center). Choose from a range of different car categories that suits your holiday: our fleet ranged from luxurious sports cars and convertibles, to powerful 4x4s, estates and economy hatchbacks. USD 20. Stay Away from SIXT in Portugal!. Latest prices: Intermediate $31/day. Car Rental at Porto Airport Off-Terminal Find SIXT's fleet of like-new vehicles at convenient pick-up & drop-off locations Choose from a range of SUVs,. Latest prices: Compact $36/day. Documents you need to rent a car in Budapest. What's the minimum age to rent a car in Riyadh? To rent a car with SIXT in Riyadh you need to be at least 21 with a valid license. If you want to save a little money on your rental, select one of our sedans. Sixt car rental at Porto Airport is open from 7. To return your SIXT vehicle, please follow directions from I275 N and I275 S towards Tampa Int'l Airport and look for signs leading you to "Rental Car Return". Finding parking in the historic centre of Porto can be a. 01. Return the vehicle to the same location where. Our branch staff can answer any questions you might have, and quickly get you into a premium vehicle so you can be on your way. 01. 6. Compare car hire at Porto Airport OPO and find the cheapest prices from all major brands. We offer convenient operating hours, so you can pick up a car after getting off your flight. Premium $32/day. At SIXT you can either pay online or when you pick up your car in Porto Airport Off-Terminal.