Siem Reap International Airport (IATA: REP, ICAO: VDSR) (Khmer: អាកាសយានដ្ឋានអន្តរជាតិសៀមរាប French: Aéroport International de Siem Reap) is Cambodia's busiest airport serving Siem Reap, a popular tourist destination due to nearby Angkor Wat. It is the busiest airport in Cambodia in terms of passenger traffic. The airport's new terminal was inaugurated on 28 August 2006.
The Cambodian government has plans to replace the airport with a new one, 60 km from Siem Reap. The airport resides at an elevation of 60 feet (18 m) above mean sea level. It has one runway designated 05/23 with a concrete surface measuring 2,550 by 45 metres (8,366 ft × 148 ft).
As of 2008, extensions to the airport's apron and parking areas are taking place. Air Traffic Control is provided by CATS (Cambodia Air Traffic Services), with full approach and aerodrome VHF facilities being housed in the control tower, between the fire station and the domestic terminal. Area control is still provided from CATS Centre in Phnom Penh (Pochentong) VHF frequencies used at Siem Reab are: Tower: 118.000 MHz (AM) Approach: 124.300 MHz (AM) ACC (FIR): 127.500 MHz (AM) Ground (apron): 121.750 MHz (AM) ATIS (WX): 129.950 MHz (AM) Tower – fire 3A: 143.750 MHz (FM) CATS are also responsible for clearing takeoffs and landings of tourist helicopters from the "Big Balloon" site, 3 km away, near Angkor Wat.
Both Helicopters Cambodia and Sokha Helicopters operate from the airport, with Sokha mainly operating from the Big Yellow Balloon site. The airport itself is located some 6 km outside Siem Reap, just off National Route 6 north. Runway alignments are 23 & 05, with only 23 being used for takeoff, due to flight restrictions over Angkor temple.