Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Osaka Kansai Intl Airport as you normally would.
October can be a great time to fly to Osaka Kansai Intl Airport from St. Louis with a flight ticket averaging about $1,252. Cheapflights users have found deals in the month of October for as cheap as $658. The most expensive prices can be found in the month of April.