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

Return flights

01 Dec - 04 Dec	Air China
26 Dec - 04 Jan	Air China
25 Dec - 30 Dec	Air China
26 Dec - 02 Jan	Air China
26 Dec - 03 Jan	Air China
29 Dec - 02 Jan	Air China
13 Dec - 19 Dec	Air China
19 Dec - 28 Dec	Air China
12 Dec - 20 Dec	Air China
09 Dec - 13 Dec	Air China
20 Dec - 27 Dec	Air China
14 Dec - 08 Jan	Air China
22 Dec - 30 Dec	Air China
11 Dec - 14 Dec	Air China
03 Dec - 06 Dec	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 455€

Return flights