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

Return flights

15 Oct - 22 Oct	Jeju Air
12 Oct - 22 Oct	Jeju Air
13 Oct - 20 Oct	Jeju Air
16 Oct - 20 Oct	Jeju Air
16 Oct - 21 Oct	Jeju Air
15 Oct - 20 Oct	Jeju Air
17 Oct - 22 Oct	Jeju Air
19 Oct - 22 Oct	Jeju Air
12 Oct - 20 Oct	Jeju Air
11 Oct - 21 Oct	Jeju Air
31 Oct - 05 Nov	EVA Air
31 Oct - 04 Nov	EVA Air
31 Oct - 03 Nov	EVA Air
29 Oct - 04 Nov	EVA Air
31 Oct - 10 Nov	EVA Air
31 Oct - 06 Nov	EVA Air
31 Oct - 07 Nov	EVA Air
20 Oct - 21 Nov	Air China
29 Oct - 09 Nov	Air China
19 Oct - 01 Nov	Air China

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

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 October from $372

Return flights