Cheapest return flights from Seoul to Chiang Mai in September from $210

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

Return flights

20 Sep - 02 Oct Jeju Air direct
20 Sep - 04 Oct Jeju Air direct
21 Sep - 02 Oct Jeju Air direct
21 Sep - 01 Oct Jeju Air direct
23 Sep - 30 Sep Air Busan
27 Sep - 30 Sep Jeju Air
21 Sep - 27 Sep Jeju Air direct
20 Sep - 28 Sep Jeju Air direct
20 Sep - 30 Sep Jeju Air direct
21 Sep - 25 Sep Jeju Air direct
20 Sep - 01 Oct Jeju Air direct
21 Sep - 22 Oct Jeju Air direct
20 Sep - 03 Oct Jeju Air direct
24 Sep - 04 Oct Eastar Jet direct
24 Sep - 02 Oct Eastar Jet direct
24 Sep - 28 Sep Jeju Air
23 Sep - 04 Oct Jin Air direct
20 Sep - 24 Sep Jeju Air direct
22 Sep - 29 Sep Air Busan
22 Sep - 30 Sep VietJet Air

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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