Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 06:05 and arrives at Koh Samui Samui International Airport at 07:10.
The flighttime is about 1h 05m. The distance travelled ("as the bird flies"): 113 Km. So the average speed is roughly 104 Km.
The best day to arrive at Bangkok is Wednesday and it would be best to avoid Thursday, as prices are on average 500.54% higher than on Wednesday. (Average prices, based on 5582533 datapoints.)
We have a lot more statistics for flights PG 101 and between Bangkok and Koh Samui.
