Gimpo International Airport (GMP) (김포공항)
International Routes from Seoul Gimpo International Airport (GMP) — as of 2025
- Japan
- Tokyo (Haneda, HND) – operated by ANA, Japan Airlines, Asiana Airlines, Korean Air
- Osaka (Kansai, KIX) – operated by Asiana Airlines, Jeju Air, Korean Air, Peach Aviation
- Nagoya (Chubu Centrair, NGO) – operated by Peach Aviation (seasonal: Aug–Oct)
- China
- Beijing (Capital, PEK) – operated by Air China, Asiana Airlines, Korean Air
- Beijing (Daxing, PKX) – operated by China Southern Airlines
- Shanghai (Hongqiao, SHA) – operated by Asiana Airlines, China Eastern Airlines, Korean Air, Shanghai Airlines
- Taiwan
- Taipei (Songshan, TSA) – operated by Eastar Jet, EVA Air, China Airlines, T’way Air
- Kaohsiung (KHH) – operated by Jeju Air, Tigerair Taiwan, T’way Air