Flight Changi Airport departs from Singapore Changi Airport at 10:20 and arrives at Koh Samui Samui International Airport at 11:00.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 475 Km. So the average speed is roughly 285 Km.
There is an 1 hour time difference between Singapore and Koh Samui
The best month to arrive at Singapore is September and the most expensive month to fly is October. (Average prices, based on 215 datapoints.)
We have a lot more statistics for flights PG 4223 and between Singapore and Koh Samui.