The runways were built on a bed of rocks manually hauled by Korean labourers from Kaihwasan and Yangchan, several miles from the base.

[5] Gimpo played a major role during the Korean War, and the USAF designated the airfield as Kimpo Air Base or K-14.

[8] Later that day, four F-80Cs of the 35th Fighter-Bomber Squadron shot down four Ilyushin Il-10s for no losses over Gimpo in the USAF's first jet-aircraft victory.

[9] On 5 August 5th Air Force fighters strafed and bombed Gimpo, destroying 9 aircraft and damaging 9 others.

[10] Gimpo was defended by a conglomeration of half-trained fighting men and service forces, and by the morning of 18 September, the Marines had secured the airfield.

[10]: 61  On 19 September, the U.S. Army Corps of Engineers repaired the local railroad up to 13 kilometres (8 mi) inland and 32 C-54 transport planes began flying in gasoline and ordnance.

On 25 September, the 811th Engineer Aviation Battalion began repairing bomb damage on the 1,800-metre (6,000 ft) asphalt runway at Gimpo and covering it with Marston matting.

Units based at Gimpo were withdrawn to the south and facilities were destroyed to prevent their use by Chinese and North Korean forces.

An additional problem was South Korea's overnight curfew (midnight to 4 am), a security measure that was in effect for decades.

(It would have been farther from Seoul than the 80 kilometres (50 mi) distance between Viracopos Airport in Campinas, Brazil, and the city of São Paulo.)

[12] "Shuttle" flights to Haneda Airport in Tokyo started in November 2003 on a charter basis, cutting 30 minutes or more of ground transportation at each end in an attempt to attract business travelers.

[19][20] Korea Airports announced an expansion and remodeling of the terminals in 2013, adding new gates and security checkpoints.

[21] In 2017, the South Korean government announced that a new terminal would be built to meet growing domestic traffic.

[39] The Aviation and Railway Accident Investigation Board (ARAIB) has its FDR/CVR Analysis and Wreckage Laboratory on the property of the airport.

[40] When the predecessor agency Korea Aviation Accident Investigation Board (KAIB) existed, its CVR/FDR and wreckage laboratory was located on the airport property.