Cheapest return flights from Seoul to Chiang Mai in September from $225

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

Return flights

13 Sep - 16 Sep Jeju Air direct
12 Sep - 16 Sep Jeju Air direct
06 Sep - 10 Sep Jeju Air direct
10 Sep - 17 Sep Jeju Air direct
02 Sep - 12 Sep Thai AirAsia X
12 Sep - 15 Sep Thai AirAsia X
03 Sep - 06 Sep Thai AirAsia X
09 Sep - 14 Sep Thai AirAsia X
11 Sep - 13 Sep Thai AirAsia X
17 Sep - 21 Sep Thai AirAsia X
28 Sep - 02 Oct Thai AirAsia X
28 Sep - 03 Oct Thai AirAsia X
30 Sep - 04 Oct AirAsia X
24 Sep - 05 Oct Thai AirAsia X
24 Sep - 01 Oct Thai AirAsia X
25 Sep - 08 Oct AirAsia X
20 Sep - 08 Oct Eastar Jet direct
28 Sep - 02 Oct Jeju Air direct
27 Sep - 08 Oct Eastar Jet direct
30 Sep - 08 Oct Eastar Jet direct

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

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