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

Return flights

15 Dec - 14 Jan	China Eastern
12 Dec - 18 Jan	China Eastern
12 Dec - 25 Jan	China Eastern
02 Dec - 13 Dec	Air China
20 Dec - 18 Jan	China Eastern
19 Dec - 18 Jan	China Eastern
19 Dec - 25 Jan	China Eastern
19 Dec - 20 Jan	China Eastern
21 Dec - 11 Jan	China Eastern
01 Dec - 15 Dec	Air China
21 Dec - 22 Jan	China Eastern
20 Dec - 28 Jan	China Eastern
02 Dec - 16 Dec	Air China
12 Dec - 14 Dec	Air China
17 Dec - 31 Dec	Jeju Air
16 Dec - 31 Dec	Air China
17 Dec - 20 Dec	Air China
17 Dec - 29 Dec	Air China
08 Dec - 21 Dec	Air China
14 Dec - 23 Dec	China Eastern

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 424€

Return flights