Cheapest return flights from Seoul to Chiang Mai in September from $586

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

Return flights

01 Sep - 05 Sep Air China
15 Sep - 22 Sep Air China
08 Sep - 17 Sep Air China
25 Sep - 29 Sep EVA Air
02 Sep - 07 Sep EVA Air
28 Sep - 10 Oct Air China
25 Sep - 28 Sep EVA Air
12 Sep - 02 Oct EVA Air
04 Sep - 10 Sep EVA Air
18 Sep - 24 Sep EVA Air
11 Sep - 02 Oct EVA Air
01 Sep - 04 Sep EVA Air
17 Sep - 24 Sep Air China
23 Sep - 02 Oct EVA Air

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

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