Flight Siem Reap-Angkor International Airport departs from Siem Reap Siem Reap-Angkor International Airport at 10:30 and arrives at Hong Kong Hong Kong International Airport at 14:05.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 1165 Km. So the average speed is roughly 451 Km.
There is an 1 hour time difference between Siem Reap and Hong Kong