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

Return flights

19 Dec - 16 Jan	China Southern
12 Dec - 03 Jan	China Southern
12 Dec - 08 Jan	China Southern
22 Dec - 06 Jan	China Southern
28 Dec - 25 Jan	China Southern
18 Dec - 29 Dec	Air China
01 Dec - 07 Dec	Air China
06 Dec - 07 Dec	Air China
14 Dec - 24 Dec	Air China
17 Dec - 26 Dec	Air China
08 Dec - 24 Dec	Air China
05 Dec - 07 Dec	Air China
01 Dec - 24 Dec	Air China
15 Dec - 12 Jan	Air China
10 Dec - 16 Dec	Air China
15 Dec - 31 Dec	Air China
15 Dec - 06 Jan	Air China
15 Dec - 15 Jan	Air China
29 Dec - 11 Jan	China Southern
18 Dec - 02 Jan	Air China

Also check the deals for one-way flights from Seoul to London 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 London in December from 523€

Return flights