Flight Samui International Airport departs from Koh Samui Samui International Airport at 19:00 and arrives at Bangkok Suvarnabhumi Airport at 20:15.
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 Monday and it would be best to avoid Friday, as prices are on average 10.19% higher than on Monday. (Average prices, based on 1276027 datapoints.)
We have a lot more statistics for flights PG 176 and between Koh Samui and Bangkok.
