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

Return flights

02 Dec - 07 Dec	China Southern
02 Dec - 11 Dec	China Southern
02 Dec - 16 Dec	China Southern
02 Dec - 23 Dec	China Southern
04 Dec - 15 Dec	Lufthansa
04 Dec - 09 Dec	Lufthansa
01 Dec - 07 Dec	China Southern
09 Dec - 16 Dec	Lufthansa
08 Dec - 15 Dec	Lufthansa
06 Dec - 13 Dec	Lufthansa
02 Dec - 29 Jan	Air China
30 Dec - 25 Jan	Air China
16 Dec - 12 Jan	Scandinavian Airlines
25 Dec - 12 Jan	Scandinavian Airlines
25 Dec - 18 Jan	Lufthansa
10 Dec - 12 Jan	Lufthansa
29 Dec - 20 Jan	Lufthansa
11 Dec - 02 Jan	Scandinavian Airlines
31 Dec - 11 Jan	Finnair
12 Dec - 17 Jan	LOT

Also check the deals for one-way flights from London to Seoul 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 London to Seoul in December from $546

Return flights