The best month to arrive at Koh Samui is November and the most expensive month to fly is August. (Average prices, based on 395 datapoints.)
The best day to arrive at Koh Samui is Friday and it would be best to avoid Sunday, as prices are on average 42.19% higher than on Friday. (Average prices, based on 395 datapoints.)
At Koh Samui the most flights depart around 09:00. (Hourly flights, based on 465 datapoints.)