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

Return flights

08 Dec - 14 Dec	Thai VietJet Air
01 Dec - 05 Dec	HK Express
01 Dec - 24 Dec	Thai VietJet Air
01 Dec - 26 Jan	Thai VietJet Air
11 Dec - 18 Dec	Air China
12 Dec - 19 Dec	Air China
16 Dec - 20 Dec	Air China
17 Dec - 21 Dec	Air China
18 Dec - 22 Dec	Air China
05 Dec - 09 Dec	Air China
01 Dec - 09 Dec	Air China
19 Dec - 11 Jan	Air China
21 Dec - 11 Jan	Air China
17 Dec - 19 Jan	Thai VietJet Air
19 Dec - 09 Jan	Thai AirAsia X
22 Dec - 09 Jan	Thai AirAsia X
22 Dec - 11 Jan	Thai AirAsia X
26 Dec - 03 Jan	STARLUX Airlines
16 Dec - 05 Jan	Thai AirAsia X
18 Dec - 05 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 290€

Return flights