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

Return flights

23 Dec - 01 Jan	T'way Air
24 Dec - 05 Jan	Jeju Air
23 Dec - 30 Dec	T'way Air
28 Dec - 01 Jan	Air Busan
23 Dec - 04 Jan	Jeju Air
27 Dec - 05 Jan	Jeju Air
23 Dec - 29 Dec	Jeju Air
23 Dec - 19 Jan	Jeju Air
31 Dec - 05 Jan	China Eastern
31 Dec - 10 Jan	Air China
27 Dec - 31 Dec	Jeju Air
25 Dec - 04 Jan	Air Busan
26 Dec - 06 Jan	Air Busan
26 Dec - 29 Dec	Air Busan
31 Dec - 31 Dec	Air China
23 Dec - 28 Dec	Asiana Airlines
23 Dec - 31 Dec	Air China
29 Dec - 30 Dec	Air China
28 Dec - 30 Dec	Japan Airlines
24 Dec - 30 Dec	Japan Airlines

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

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 December from $344

Return flights