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

Return flights

03 Mar - 06 Mar	China Eastern
13 Mar - 20 Mar	Air China
10 Mar - 20 Mar	Air China
05 Mar - 20 Mar	Air China
01 Mar - 22 Mar	Air China
24 Mar - 30 Mar	Air China
13 Mar - 22 Mar	Air China
24 Mar - 27 Mar	Air China
16 Mar - 22 Mar	Air China
17 Mar - 22 Mar	Air China
05 Mar - 09 Apr	Air China
30 Mar - 04 Apr	Air China
28 Mar - 04 Apr	Air China
28 Mar - 02 Apr	Air China
31 Mar - 06 Apr	EVA Air
28 Mar - 23 Apr	EVA Air
20 Mar - 03 Apr	EVA Air
20 Mar - 02 Apr	Air China

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

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 March from 374€

Return flights