Cheapest return flights from Seoul to Chiang Mai in September from $337

Best time to book flights for Seoul (ICN) to Chiang Mai (CNX) flights at AirHint

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

Return flights

13 Sep - 20 Sep Cathay Pacific
13 Sep - 19 Sep Cathay Pacific
01 Sep - 05 Sep Malaysia Airlines
12 Sep - 15 Sep Malaysia Airlines
05 Sep - 08 Sep Malaysia Airlines
26 Sep - 13 Oct Malaysia Airlines
14 Sep - 12 Oct Malaysia Airlines
10 Sep - 14 Sep Malaysia Airlines
28 Sep - 11 Oct Malaysia Airlines
28 Sep - 10 Oct Malaysia Airlines
29 Sep - 11 Oct Malaysia Airlines
27 Sep - 10 Oct Malaysia Airlines
11 Sep - 17 Sep China Airlines
12 Sep - 17 Sep China Airlines
25 Sep - 30 Sep China Airlines
27 Sep - 14 Oct China Airlines
09 Sep - 16 Sep China Airlines
29 Sep - 09 Oct Malaysia Airlines
28 Sep - 02 Oct Malaysia Airlines
28 Sep - 05 Oct Malaysia Airlines

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

Skyscanner

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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