Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 14:05 and arrives at Siem Reap Siem Reap-Angkor International Airport at 15:15.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 340 Km. So the average speed is roughly 291 Km.
The best day to arrive at Bangkok is Sunday and it would be best to avoid Wednesday, as prices are on average 184.01% higher than on Sunday. (Average prices, based on 335147 datapoints.)
We have a lot more statistics for flights PG 913 and between Bangkok and Siem Reap.