September can be a great time to fly to Kota Kinabalu from Chicago O'Hare Intl Airport with a flight ticket averaging about $1,326. Cheapflights users have found deals in the month of September for as cheap as $998. The most expensive prices can be found in the month of December.
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 Kota Kinabalu as you normally would.