The best month to arrive at Koh Samui is November and the most expensive month to fly is August. (Average prices, based on 398 datapoints.)
The best day to arrive at Koh Samui is Monday and it would be best to avoid Sunday, as prices are on average 49.73% higher than on Monday. (Average prices, based on 261 datapoints.)
At Koh Samui the most flights depart around 06:00. (Hourly flights, based on 440 datapoints.)