Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Chicago O'Hare Intl Airport to Koh Samui as you normally would.
The best pricing can be found in the month of February. Prices to Koh Samui from Chicago O'Hare Intl Airport average $1,066. You can even find prices in February for less than $1,066, as users have found deals to Koh Samui from as low as $771. The month of June appears to be one of the more expensive times to travel to Koh Samui from Chicago O'Hare Intl Airport. Flying in the targeted month can save you up to 44%.