AirHint found the following cheapest return flights from Seoul (GMP) to Chiang Mai (CNX) in December 2026 (see full year).

Return flights

23 Dec - 27 Dec	Air China
01 Dec - 05 Dec	Air China
02 Dec - 06 Dec	Air China
24 Dec - 27 Dec	Air China
09 Dec - 13 Dec	Air China
13 Dec - 19 Dec	Air China
13 Dec - 18 Dec	Air China
14 Dec - 23 Dec	Air China
23 Dec - 26 Dec	Air China
21 Dec - 29 Dec	Air China
23 Dec - 02 Jan	Air China
23 Dec - 01 Jan	Air China
21 Dec - 02 Jan	Air China
01 Dec - 05 Jan	Air China
19 Dec - 02 Jan	Air China
24 Dec - 03 Jan	Air China
24 Dec - 02 Jan	Air China
26 Dec - 01 Jan	Air China
30 Dec - 03 Jan	Air China
25 Dec - 02 Jan	Air China

Also check the deals for one-way flights from Seoul 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 Seoul to Chiang Mai in December from 418€

Return flights