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
$ 337
13 Sep
- 19 Sep
Cathay Pacific
$ 362
01 Sep
- 05 Sep
Malaysia Airlines
$ 363
12 Sep
- 15 Sep
Malaysia Airlines
$ 363
05 Sep
- 08 Sep
Malaysia Airlines
$ 363
26 Sep
- 13 Oct
Malaysia Airlines
$ 363
14 Sep
- 12 Oct
Malaysia Airlines
$ 363
10 Sep
- 14 Sep
Malaysia Airlines
$ 365
28 Sep
- 11 Oct
Malaysia Airlines
$ 367
28 Sep
- 10 Oct
Malaysia Airlines
$ 367
29 Sep
- 11 Oct
Malaysia Airlines
$ 369
27 Sep
- 10 Oct
Malaysia Airlines
$ 370
11 Sep
- 17 Sep
China Airlines
$ 373
12 Sep
- 17 Sep
China Airlines
$ 373
25 Sep
- 30 Sep
China Airlines
$ 373
27 Sep
- 14 Oct
China Airlines
$ 373
09 Sep
- 16 Sep
China Airlines
$ 374
29 Sep
- 09 Oct
Malaysia Airlines
$ 385
28 Sep
- 02 Oct
Malaysia Airlines
$ 395
28 Sep
- 05 Oct
Malaysia Airlines
$ 396
Also check the deals for one-way flights from Seoul to Chiang Mai in September .
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.