Flight Samui International Airport departs from Koh Samui Samui International Airport at 19:30 and arrives at Bangkok Suvarnabhumi Airport at 20:45.
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 Saturday, as prices are on average 129.48% higher than on Friday. (Average prices, based on 1026974 datapoints.)
We have a lot more statistics for flights PG 186 and between Koh Samui and Bangkok.
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