The best month to arrive at Koh Samui is November and the most expensive month to fly is August. (Average prices, based on 513 datapoints.)
The best day to arrive at Koh Samui is Wednesday and it would be best to avoid Sunday, as prices are on average 60.87% higher than on Wednesday. (Average prices, based on 507 datapoints.)
At Koh Samui the most flights depart around 09:00. (Hourly flights, based on 578 datapoints.)