The airport said smog had hampered flights from taking off or landing, with around 100-200 meters visibility recorded since Sunday evening.
A warning on low visibility has been issued at 7:50 p.m. on Sunday and has not been lifted off as of 1 p.m. Monday, the airport said.
The Seoul Regional Aviation Administration issues warnings when the visibility falls below 400 meters.
Eleven flights including a Delta Air Lines flight that departed from Atlanta en route to Incheon, had to fly back or divert to nearby airports including Osaka’s Kansai Airport, Seoul’s Gimpo and Jeju Airport. Eleven flights were also delayed from taking off at Incheon Airport due to bad weather conditions as of 1 p.m.
The Korea Aviation Meteorological Agency said this situation expected to be normalized later in the day as the temperature rises.
By Kim Da-sol (firstname.lastname@example.org)