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

Return flights

02 Apr - 06 Apr	Air China
02 Apr - 09 Apr	Air China
04 Apr - 09 Apr	Air China
14 Apr - 18 Apr	Air China
04 Apr - 07 Apr	Air China
02 Apr - 07 Apr	Air China
01 Apr - 07 Apr	EVA Air
03 Apr - 07 Apr	EVA Air
16 Apr - 30 May	Air China
21 Apr - 25 Apr	Air China
11 Apr - 18 Apr	Air China
30 Apr - 28 May	Air China
25 Apr - 07 May	EVA Air
30 Apr - 07 May	Air China
30 Apr - 05 May	Air China
29 Apr - 05 May	EVA Air
29 Apr - 18 May	EVA Air
29 Apr - 04 May	EVA Air

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

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 April from 453€

Return flights