Flight Siem Reap-Angkor International Airport departs from Siem Reap Siem Reap-Angkor International Airport at 20:05 and arrives at Hong Kong Hong Kong International Airport at 23:35.
The flighttime is about 2h 30m. The distance travelled ("as the bird flies"): 1165 Km. So the average speed is roughly 466 Km.
There is an 1 hour time difference between Siem Reap and Hong Kong