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

Return flights

13 Dec - 03 Jan	China Southern
15 Dec - 23 Dec	Air China
01 Dec - 04 Dec	Air China
16 Dec - 23 Dec	Air China
14 Dec - 23 Dec	Air China
04 Dec - 09 Dec	Air China
01 Dec - 08 Dec	Air China
05 Dec - 15 Dec	Air China
03 Dec - 09 Dec	Air China
02 Dec - 09 Dec	Air China
18 Dec - 02 Jan	Air China
13 Dec - 09 Jan	Air China
19 Dec - 01 Jan	China Southern
03 Dec - 15 Dec	Air China
27 Dec - 07 Jan	China Southern
29 Dec - 07 Jan	China Southern
29 Dec - 05 Jan	Shanghai Airlines
18 Dec - 04 Jan	Air China
16 Dec - 07 Jan	Air China
22 Dec - 10 Jan	China Southern

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 544€

Return flights