AirHint found the following cheapest return flights from Seoul (GMP) to Bangkok (BKK) in August 2025 (see full year).

Return flights

20 Aug - 27 Aug	China Eastern
29 Aug - 02 Sep	China Eastern
28 Aug - 31 Aug	Jeju Air
27 Aug - 31 Aug	Jeju Air
18 Aug - 11 Sep	Jeju Air
28 Aug - 03 Sep	Air Busan
18 Aug - 31 Aug	Jeju Air
20 Aug - 31 Aug	Jeju Air
22 Aug - 31 Aug	Jeju Air
29 Aug - 31 Aug	Jeju Air
21 Aug - 24 Aug	Jin Air
21 Aug - 23 Aug	Jeju Air
30 Aug - 31 Aug	Jeju Air
29 Aug - 29 Sep	Jeju Air
27 Aug - 01 Sep	Jeju Air
28 Aug - 01 Sep	Jeju Air
18 Aug - 01 Sep	Jeju Air
29 Aug - 01 Sep	Jeju Air
25 Aug - 28 Sep	Jeju Air
25 Aug - 04 Sep	Jeju Air

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

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 August from 224€

Return flights