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

Return flights

08 Dec - 10 Dec	T'way Air
10 Dec - 13 Dec	China Eastern
11 Dec - 14 Dec	Air China
04 Dec - 07 Dec	Air China
22 Dec - 01 Jan	Air China
01 Dec - 05 Dec	Air China
10 Dec - 14 Dec	Air China
03 Dec - 08 Dec	Air China
05 Dec - 08 Dec	Air China
10 Dec - 15 Dec	Air China
08 Dec - 12 Dec	Air China
22 Dec - 12 Jan	Air China
24 Dec - 01 Jan	Air China
19 Dec - 05 Jan	Air China
19 Dec - 09 Jan	Air China
18 Dec - 06 Jan	Air China
24 Dec - 04 Jan	Air China
21 Dec - 14 Jan	Air China
20 Dec - 07 Jan	EVA Air
18 Dec - 09 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 263€

Return flights