Seoul Incheon International Airport (IIA) (IATA: ICN, ICAO: RKSI) is the largest airport in South Korea, and one of the largest in Asia.

Seoul International Airport is the hub for Korean Air, Asiana Airlines, and Cargo 360. The airport opened for business in early 2001, replacing the international function of the old Gimpo Airport (formerly Kimpo International Airport). Gimpo Airport now serves only domestic destinations, except flights to Haneda Airport in Tokyo.

In 2009, Incheon International Airport has been voted as the world's best airport, according to a 10-month survey of airline passengers by Skytrax. The airport boasts many unique luxury features such as a golf course, spa, private sleeping rooms, a casino, and indoor gardens.