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

Return flights

01 Dec - 15 Dec	China Southern
02 Dec - 14 Dec	China Southern
01 Dec - 22 Dec	China Southern
02 Dec - 16 Dec	China Southern
02 Dec - 11 Dec	China Southern
02 Dec - 10 Dec	China Southern
01 Dec - 07 Dec	China Southern
03 Dec - 17 Dec	China Southern
01 Dec - 10 Dec	China Southern
02 Dec - 07 Dec	China Southern
01 Dec - 14 Jan	Air China
07 Dec - 21 Jan	Lufthansa
06 Dec - 21 Jan	Lufthansa
15 Dec - 14 Jan	Lufthansa
09 Dec - 12 Jan	Lufthansa
30 Dec - 21 Jan	Lufthansa
16 Dec - 07 Jan	Lufthansa
29 Dec - 19 Jan	Lufthansa
27 Dec - 24 Jan	China Southern
29 Dec - 12 Jan	Finnair

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 $583

Return flights