Flight Samui International Airport departs from Koh Samui Samui International Airport at 16:30 and arrives at Bangkok Suvarnabhumi Airport at 17:45.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 113 Km. So the average speed is roughly 90 Km.
The best day to arrive at Koh Samui is Friday and it would be best to avoid Thursday, as prices are on average 141.98% higher than on Friday. (Average prices, based on 1695399 datapoints.)
We have a lot more statistics for flights PG 154 and between Koh Samui and Bangkok.
