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

Return flights

02 Dec - 07 Dec	China Eastern
01 Dec - 07 Dec	Air China
16 Dec - 14 Jan	Air China
18 Dec - 09 Jan	Air China
16 Dec - 07 Jan	Air China
23 Dec - 09 Jan	Air China
18 Dec - 31 Dec	Air China
16 Dec - 31 Dec	Air China
13 Dec - 02 Jan	Air China
04 Dec - 11 Dec	Air China
23 Dec - 31 Dec	Air China
24 Dec - 02 Jan	Air China
16 Dec - 26 Dec	Air China
18 Dec - 26 Dec	Air China
25 Dec - 31 Dec	Air China
23 Dec - 30 Jan	Air China
25 Dec - 02 Jan	Air China
27 Dec - 02 Jan	Air China
25 Dec - 03 Jan	Air China
06 Dec - 10 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 $496

Return flights