Gimpo International Airport Station is a subway, railway and light rail station on Seoul Subway Line 5, Line 9, AREX, the Gimpo Goldline and the Seohae Line. True to its name, it serves the nearby Gimpo Airport, the hub of domestic flights in the Seoul metropolitan area as well as a limited number of regional international flights to and from China, Japan, and Taiwan. Upon its opening in 1996, it became the first railway station in the Korean Peninsula to directly serve an airport.

Seoul Subway Line 5 of the Seoul Metropolitan Subway, dubbed the purple line, is a long line crossing from west to the east across the Seoul National Capital Area, South Korea. It is one of two subway lines in Seoul to cross under the Han River, which is done at two points. The main line runs through to Hanam Geomdansan Station while the branch line from Gangdong Station terminates at Macheon Station. In 2019, Line 5 carried an annual ridership of 334 million or about 915,000 passengers per day.