- There are several airports that go by the name "REP airport." However, the most common interpretation is that it refers to Siem Reap International Airport (IATA code: REP), located in Siem Reap, Cambodia. This airport serves as the main gateway for tourists visiting the nearby Angkor Wat temples and other attractions in the region. Siem Reap International Airport is one of the busiest airports in Cambodia and offers both domestic and international flights.