Flight Samui International Airport departs from Koh Samui Samui International Airport at 21:25 and arrives at Bangkok Suvarnabhumi Airport at 23:00.
The flighttime is about 1h 35m. The distance travelled ("as the bird flies"): 113 Km. So the average speed is roughly 71 Km.
The best day to arrive at Koh Samui is Sunday and it would be best to avoid Thursday, as prices are on average 181.68% higher than on Sunday. (Average prices, based on 1276875 datapoints.)
We have a lot more statistics for flights PG 180 and between Koh Samui and Bangkok.