Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 19:00 and arrives at Hat Yai Hat Yai International Airport at 20:25.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 143 Km. So the average speed is roughly 101 Km.
The best day to arrive at Bangkok is Saturday and it would be best to avoid Tuesday, as prices are on average 91.1% higher than on Saturday. (Average prices, based on 312490 datapoints.)
We have a lot more statistics for flights WE 267 and between Bangkok and Hat Yai.