Incheon International Airport has separate Terminal 1 and Terminal 2 buildings. Check the terminal shown by your airline before traveling. The airport's official guide says the airport railroad can be used between terminals for a fee. Its published estimate is six minutes on the train, with a listed fare of KRW 1,050; walking to the station and waiting for the train take additional time.

The airport also publishes inter-terminal shuttle bus information. Travelers who need a wheelchair-accessible lift vehicle should contact the airport in advance; availability depends on vehicles and staff. Recheck boarding locations, operating hours, and fares on the airport's official site on your travel day.