https://www.dekut.com/Education/seoul-incheon-airport-icao-code/ Seoul Incheon Airport ICAO code is (ICN). This three-letter IATA code is based on the name of the airport. Its elevation above sea level is 7 meters above sea level. This airport is Regarded as the country’s largest airport, this facility has won several awards including the one for its cleanliness. Seoul Incheon International Airport (ICN) is the world’s cleanest airport. Tue, 11 May 2021 10:00:23 UTC en