Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 19:10 and arrives at Siem Reap Siem Reap-Angkor International Airport at 20:15.
The flighttime is about 1h 05m. The distance travelled ("as the bird flies"): 340 Km. So the average speed is roughly 314 Km.
The best day to arrive at Bangkok is Sunday and it would be best to avoid Thursday, as prices are on average 62.22% higher than on Sunday. (Average prices, based on 337477 datapoints.)
We have a lot more statistics for flights WE 590 and between Bangkok and Siem Reap.