The best month to arrive at Koh Samui is November and the most expensive month to fly is August. (Average prices, based on 855 datapoints.)
The best day to arrive at Koh Samui is Wednesday and it would be best to avoid Friday, as prices are on average 88.83% higher than on Wednesday. (Average prices, based on 517 datapoints.)
At Koh Samui the most flights depart around 10:00. (Hourly flights, based on 963 datapoints.)