Incheon International Airport — Seoul, South Korea

Built on reclaimed tidal flats between the islands of Yeongjong and Yongyu and opened in 2001, ICN replaced the cramped Gimpo field as South Korea's primary international gateway. The airport anchors Seoul's air links to the world, handling both Korean Air and Asiana as home carriers alongside dozens of foreign airlines routing through northeast Asia. A second terminal opened in 2018 to accommodate SkyTeam partners, easing congestion at the original building. Beyond aircraft movements, ICN has built a reputation for passenger comfort, offering indoor gardens, a spa, an ice-skating rink, and even a small golf course inside its transit areas, along with free short city tours for long-layover travelers. A dedicated express rail line links the terminals to central Seoul in well under an hour, reinforcing the airport's role as a showcase gateway.