Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Chiang Mai to Kansas City as you normally would.
Related info for your journey
Useful info, stats and facts about Chiang Mai to Kansas City flights.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Chiang Mai Airport to Kansas City Airport flight would often be abbreviated as a CNX to MCI flight.