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

Return flights

05 Dec - 10 Dec	EVA Air
05 Dec - 09 Dec	EVA Air
03 Dec - 10 Dec	Jeju Air
09 Dec - 16 Dec	Jeju Air
09 Dec - 17 Dec	Jeju Air
11 Dec - 15 Dec	Jeju Air
03 Dec - 09 Dec	Jeju Air
12 Dec - 16 Dec	EVA Air
11 Dec - 16 Dec	Jeju Air
17 Dec - 07 Jan	EVA Air
11 Dec - 18 Dec	Jeju Air
15 Dec - 20 Jan	Jeju Air
27 Dec - 01 Jan	Air China
26 Dec - 05 Jan	Air China
29 Dec - 10 Jan	Air China
22 Dec - 11 Jan	Air China
22 Dec - 01 Jan	Air China
30 Dec - 07 Jan	EVA Air
31 Dec - 06 Jan	EVA Air
26 Dec - 01 Jan	Air China

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 $440

Return flights