Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 16:30 and arrives at Hat Yai Hat Yai International Airport at 18:00.
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 Monday and it would be best to avoid Saturday, as prices are on average 115.58% higher than on Monday. (Average prices, based on 347560 datapoints.)
We have a lot more statistics for flights FD 4204 and between Bangkok and Hat Yai.