Flight Siem Reap-Angkor International Airport departs from Siem Reap Siem Reap-Angkor International Airport at 11:40 and arrives at Singapore Changi Airport at 14:40.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 322 Km. So the average speed is roughly 161 Km.
There is an 1 hour time difference between Siem Reap and Singapore