Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 12:30 and arrives at Hat Yai Hat Yai International Airport at 14:00.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 143 Km. So the average speed is roughly 95 Km.
The best day to arrive at Bangkok is Saturday and it would be best to avoid Monday, as prices are on average 97.63% higher than on Saturday. (Average prices, based on 313278 datapoints.)
We have a lot more statistics for flights TG 263 and between Bangkok and Hat Yai.