Cheapest return flights from Seoul to Chiang Mai in September from $224

AirHint found the following cheapest return flights from Seoul (ICN) to Chiang Mai (CNX) in September 2025 (see full year).

Return flights

18 Sep - 23 Sep Vietnam Airlines
02 Sep - 25 Sep Jin Air direct
15 Sep - 25 Sep Jin Air direct
03 Sep - 11 Sep Jin Air direct
15 Sep - 02 Oct Jin Air direct
15 Sep - 01 Oct Jin Air direct
18 Sep - 22 Sep Vietnam Airlines
13 Sep - 25 Sep Eastar Jet direct
14 Sep - 25 Sep Eastar Jet direct
13 Sep - 02 Oct Eastar Jet direct
13 Sep - 01 Oct Eastar Jet direct
14 Sep - 02 Oct Eastar Jet direct
14 Sep - 01 Oct Eastar Jet direct
15 Sep - 26 Sep Jeju Air direct
09 Sep - 11 Sep Jin Air direct
09 Sep - 25 Sep Jin Air direct
01 Sep - 01 Oct Jin Air direct
23 Sep - 02 Oct Jin Air direct
23 Sep - 01 Oct Jin Air direct
20 Sep - 02 Oct Jin Air direct

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

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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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