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

Return flights

16 Dec - 02 Jan	Air China
04 Dec - 11 Dec	China Southern
16 Dec - 11 Jan	Air China
16 Dec - 14 Jan	Air China
21 Dec - 09 Jan	China Southern
18 Dec - 02 Jan	Air China
18 Dec - 31 Dec	Air China
28 Dec - 09 Jan	China Southern
05 Dec - 12 Dec	Air China
18 Dec - 26 Dec	Air China
18 Dec - 09 Jan	China Southern
20 Dec - 25 Dec	MIAT Mongolian Airlines
14 Dec - 19 Dec	Air China
04 Dec - 14 Jan	Air China
18 Dec - 24 Dec	Air China
04 Dec - 10 Dec	Air China
14 Dec - 20 Dec	Air China
03 Dec - 09 Dec	Emirates
20 Dec - 02 Jan	Air China
16 Dec - 13 Jan	Emirates

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 $615

Return flights