The IATA code KOS is derived from Sihanoukville's alternative name, "Kampong Som".

[4] After a long period of dormancy during and after the Khmer Rouge era, the airport formally reopened on 5 January 2007.

[5] The runway was extended to a length of 3,300 metres (10,827 ft) in order to accommodate 4E class aircraft.

The service was further adjusted to continue Phnom Penh as well, operating a triangle route, Siem Reap-Sihanoukville-Phnom Penh-Siem Reap, starting on 31 March 2013.

Starting in September 2013, the airline was scheduled to provide a Siem Reap-Sihanoukville route twice daily during the high peak season.