AirHint found the following cheapest return flights from Seoul (GMP) to Bangkok (BKK) in September 2026 (see full year).

Return flights

14 Sep - 24 Sep	Air China
07 Sep - 18 Sep	Air China
07 Sep - 17 Sep	Air China
14 Sep - 23 Sep	Air China
11 Sep - 16 Sep	Air China
10 Sep - 17 Sep	Air China
13 Sep - 24 Sep	Air China
13 Sep - 23 Sep	Air China
16 Sep - 20 Sep	Air China
15 Sep - 13 Oct	Air China
05 Sep - 12 Sep	Air China
28 Sep - 06 Oct	Air China
30 Sep - 10 Oct	Air China
19 Sep - 05 Oct	Air China
24 Sep - 04 Oct	Air China

Also check the deals for one-way flights from Seoul to Bangkok 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.

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Cheapest return flights from Seoul to Bangkok in September from 423€

Return flights