Most flights into Seoul arrive in the bigger Incheon Airport which is found about 60km from downtown Seoul, but some get there into Gimpo Airport which is situated nearer to town (around 20km away). The two the bus community and Subway / Metro community in Seoul is efficient and inexpensive. https://sergiolapal.dbblog.net/10885919/not-known-details-about-seoul-gangnam-퍼펙트가라오케-nightlife-place