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

Return flights

31 Aug - 07 Sep	Korean Air
31 Aug - 03 Sep	Korean Air
27 Aug - 01 Sep	Korean Air
22 Aug - 25 Aug	China Eastern
08 Aug - 12 Aug	China Eastern
14 Aug - 19 Aug	China Eastern
16 Aug - 18 Aug	China Eastern
25 Aug - 02 Sep	Jeju Air
27 Aug - 02 Sep	Jeju Air
26 Aug - 02 Sep	Jeju Air
22 Aug - 24 Aug	China Eastern
20 Aug - 24 Aug	China Eastern
23 Aug - 29 Aug	T'way Air
28 Aug - 02 Sep	Jeju Air
07 Aug - 11 Aug	China Eastern
25 Aug - 01 Sep	Jeju Air
14 Aug - 18 Aug	China Eastern
25 Aug - 27 Aug	Jeju Air
26 Aug - 01 Sep	Jeju Air
26 Aug - 03 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 $244

Return flights