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

Return flights

24 Dec - 06 Jan	China Southern
25 Dec - 18 Jan	China Southern
11 Dec - 04 Jan	China Southern
24 Dec - 25 Jan	China Southern
24 Dec - 04 Jan	China Southern
01 Dec - 07 Dec	Air China
22 Dec - 15 Jan	Air China
19 Dec - 08 Jan	Air China
21 Dec - 14 Jan	Air China
22 Dec - 13 Jan	Air China
19 Dec - 12 Jan	Air China
05 Dec - 07 Dec	Air China
04 Dec - 07 Dec	Air China
11 Dec - 17 Dec	Air China
02 Dec - 08 Dec	Air China
20 Dec - 27 Dec	China Eastern
01 Dec - 08 Dec	Air China
01 Dec - 05 Dec	Air China
16 Dec - 31 Dec	Air China
03 Dec - 08 Dec	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 391€

Return flights