The best month to arrive at Koh Samui is November and the most expensive month to fly is August. (Average prices, based on 816 datapoints.)
The best day to arrive at Koh Samui is Wednesday and it would be best to avoid Friday, as prices are on average 85.72% higher than on Wednesday. (Average prices, based on 805 datapoints.)
At Koh Samui the most flights depart around 09:00. (Hourly flights, based on 905 datapoints.)
From Koh Samui it is on average the cheapest to fly to Bangkok and to Phuket. (Average prices, based on 660 datapoints.)