Getting from Incheon International Airport to Gimpo International Airport is easy by taking the Airport Railroad (AREX) All Stop Train.
Traveling from Incheon International Airport and Gimpo International Airport takes about 33 minutes (5 stops) on the AREX All Stop Train. The cost is 3,550 won.
To reach the station, follow the Airport Railroad signs which appear throughout the terminals at both airports.
Read more about the All Stop Train.