AirHint found the following cheapest return flights from Osaka (KIX) to Chiang Mai (CNX) in December 2025 (see full year).

Return flights

17 Dec - 21 Dec	Air China
03 Dec - 15 Dec	Air China
09 Dec - 12 Dec	Air China
10 Dec - 13 Dec	Air China
14 Dec - 19 Dec	Air China
15 Dec - 20 Dec	Air China
03 Dec - 08 Dec	Air China
04 Dec - 09 Dec	Air China
02 Dec - 07 Dec	Air China
05 Dec - 10 Dec	Air China
20 Dec - 10 Jan	Thai AirAsia X
17 Dec - 07 Jan	Thai AirAsia X
20 Dec - 07 Jan	Thai AirAsia X
17 Dec - 06 Jan	Thai AirAsia X
20 Dec - 06 Jan	Thai AirAsia X
19 Dec - 07 Jan	Thai AirAsia X
20 Dec - 08 Jan	Thai AirAsia X
19 Dec - 06 Jan	Thai AirAsia X
26 Dec - 07 Jan	Thai VietJet Air
17 Dec - 04 Jan	Thai AirAsia X

Also check the deals for one-way flights from Osaka to Chiang Mai in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Osaka to Chiang Mai in December from $263

Return flights