AirHint found the following cheapest return flights from Seoul (GMP) to Chiang Mai (CNX) in January 2027 (see full year).

Return flights

17 Jan - 27 Jan	Air China
18 Jan - 23 Jan	Air China
23 Jan - 01 Feb	Air China
17 Jan - 01 Feb	Air China
18 Jan - 01 Feb	Air China
15 Jan - 01 Feb	Air China
21 Jan - 01 Feb	Air China
31 Jan - 03 Feb	Air China
13 Jan - 20 Jan	Air China
13 Jan - 19 Jan	Air China
02 Jan - 16 Jan	Air China
14 Jan - 20 Jan	Air China
05 Jan - 19 Jan	Air China
11 Jan - 19 Jan	Air China
03 Jan - 07 Jan	Air China
16 Jan - 01 Feb	Air China
20 Jan - 01 Feb	Air China
22 Jan - 01 Feb	Air China
31 Jan - 02 Feb	Air China
12 Jan - 21 Jan	Air China

Also check the deals for one-way flights from Seoul to Chiang Mai in January.

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 January from 454€

Return flights