Traffic in South Korea is heavily concentrated: Incheon International Airport (ICN) alone handles about 71.2 million passengers a year, roughly 57% of the 125 million across the 4 airports listed here. That pattern is typical of a country with one dominant hub carrier feeding a single gateway.
Between them these airports operate 10 runways serving 3 cities, all on a single national clock. Every airport below links to a live map of aircraft observed within available ADS-B coverage around the field.
The next airport in the ranking is Jeju International Airport (CJU) at about 29.7 million passengers. The gap to ICN is 41.5 million, while the three busiest airports account for roughly 100% of traffic represented by this list. Most listed traffic is therefore concentrated at the top of the network.
The airports are spread across roughly 4 degrees of latitude and 2 degrees of longitude. The network is geographically compact enough that most domestic sectors remain comparatively short. Field elevations vary less dramatically than they do in the world's mountain-airport networks. The average across this selected set is 2.5 runways per airport.
Read airport by airport, the selected South Korea network is not interchangeable: Incheon International Airport (ICN) has 4 runways and about 71.2 million annual passengers, Jeju International Airport (CJU) has 2 runways and about 29.7 million annual passengers, Gimpo International Airport (GMP) has 2 runways and about 24.0 million annual passengers and Gimhae International Airport (PUS) has 2 runways and no comparable traffic figure. Those differences matter when comparing a live map. A larger passenger total indicates schedule scale, while runway count describes physical layout; neither number by itself proves how delayed, connected or operationally efficient an airport will be on a particular day.
With 4 gateways in this data cut, the South Korea hierarchy is readable directly: ICN contributes 57% of the represented passenger total, CJU contributes 24% of the represented passenger total, GMP contributes 19% of the represented passenger total and PUS contributes 0% of the represented passenger total. That makes ICN the first gateway here without reducing CJU to a minor field, since its traffic is about 42% of ICN's.
The physical ranking differs from the traffic ranking: ICN has 4 listed runways, CJU has 2 listed runways, GMP has 2 listed runways and PUS has 2 listed runways. CJU is the highest of the group at 118 ft, against 6 ft at PUS. Those facts describe layout and setting, not a live capacity forecast; weather, active runway configuration and traffic flow still decide what a viewer sees on the map at a given hour.