Seoul Incheon International Airport has several major car rental agencies directly on premises: Avis, Sixt and AJ Rent-a-Car among them. Most travelers will likely want to take advantage of one of these options, as the airport is on a small island and no other options are available save a series of other AJ Rent-a-Car locations in downtown Seoul, about an hour from the airport either by shuttle bus or by train, which means a very expensive taxi ride.
Driving Near Incheon International Airport
As mentioned previously, Incheon is located on a small island with only two roads off of it: Expressway No. 130, which goes east toward downtown Seoul, and Expressway No. 110, which goes southeast toward the cities of Incheon and Siheung.
Traffic can be very heavy en route from the airport to any of these cities, particularly on Friday and Saturday nights. If traffic is bad, plan for it to take around 90 minutes to reach Seoul.
Some general tips for driving anywhere in Seoul: remember that police keep their lights flashing at all times while on duty. Also be prepared for driving that would be considered overly aggressive by the standards of some other countries.
Gas Stations Near Incheon International Airport
There is only one gas station near the airport, an SK station on the southwest side that usually charges higher prices than other stations in the Seoul area. This station is also not open overnight.
You will not see any other gas stations on the island. The next closest options are across the water in Incheon. The fastest way to get to them is to take Expressway 110 to Dongchun-dong, a trip of roughly 15 miles.
Picking Up A Car In Seoul
You may find a better rate on a rental vehicle at one of the agencies in Seoul. Fortunately, it's easy to get there from the airport without driving.
The primary, and usually the fastest, option is to take the Airport Railroad Express light rail, which only takes about 45 minutes under optimal conditions. There is a more expensive, but faster, express train that only stops at the airport and downtown Seoul, and a less expensive line that makes a dozen stops en route. Keep in mind that these lines only run from about 5:30 AM to 11:30 PM, however. If you need transit while the train is not running, there is an "all night" bus that goes to Seoul Station, with a few stops in between, and leaves roughly once an hour from the airport.
Many different types of private taxis and shuttle buses are also available at all hours. The Seoul area has a few different tiers of taxi that have different sizes and creature comforts inside.