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

Return flights

17 Oct - 24 Oct	Air China
29 Oct - 04 Nov	Air China
26 Oct - 30 Oct	Air China
24 Oct - 31 Oct	Air China
25 Oct - 31 Oct	Air China
31 Oct - 07 Nov	Air China
17 Oct - 31 Oct	Air China
13 Oct - 20 Oct	Air China
01 Oct - 01 Nov	Air China
17 Oct - 20 Oct	Air China
07 Oct - 13 Oct	EVA Air
08 Oct - 10 Oct	Air China
03 Oct - 10 Oct	Air China
26 Oct - 02 Nov	Air China
30 Oct - 30 Nov	Air China
05 Oct - 04 Nov	Air China

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

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 October from 469€

Return flights