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

Return flights

13 Dec - 20 Dec	Air China
12 Dec - 19 Dec	Air China
22 Dec - 01 Jan	Air China
23 Dec - 26 Dec	Air China
24 Dec - 27 Dec	Air China
24 Dec - 31 Dec	Air China
24 Dec - 30 Dec	Air China
12 Dec - 14 Dec	Air China
06 Dec - 08 Dec	Air China
13 Dec - 18 Dec	Air China
06 Dec - 15 Dec	Air China
18 Dec - 01 Jan	Air China
22 Dec - 08 Jan	Air China
18 Dec - 08 Jan	Air China
17 Dec - 08 Jan	Air China
23 Dec - 13 Jan	Air China
21 Dec - 12 Jan	Air China
21 Dec - 13 Jan	Air China
25 Dec - 01 Jan	Air China
18 Dec - 07 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 189€

Return flights