The easiest way to get to downtown Seoul from Gimpo International Airport is by taking the all-stop train. It travels on the Airport Railroad Express (A’REX) and takes about 20 minutes to reach Seoul Station from Gimpo International Airport. You can also opt for airport limousine buses (tickets start from 2,500 won), intercity buses (6,500 won), as well as luxury and regular taxi services (between 20,000 won and 40,000 won).