Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Koh Samui to Chicago O'Hare Intl Airport as you normally would.
Most people fly from Ko Samui (USM) if they book a flight from Koh Samui to Chicago O'Hare Intl. On average, Ko Samui has 0 outbound flights to Chicago O'Hare Intl per day from 0 airlines. Ko Samui is conveniently located just 3.3 km from Koh Samui’s city centre.