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

Return flights

23 Dec - 07 Jan	China Southern
23 Dec - 13 Jan	China Southern
24 Dec - 12 Jan	China Southern
23 Dec - 10 Jan	China Southern
26 Dec - 03 Jan	Air China
23 Dec - 20 Jan	China Southern
23 Dec - 11 Jan	China Southern
23 Dec - 21 Jan	China Southern
23 Dec - 19 Jan	China Southern
23 Dec - 14 Jan	China Southern
23 Dec - 31 Dec	China Southern
27 Dec - 31 Dec	LOT
29 Dec - 31 Dec	Lufthansa
25 Dec - 30 Dec	Finnair
27 Dec - 29 Dec	Hainan Airlines
22 Dec - 30 Dec	Finnair
28 Dec - 31 Dec	Air France
22 Dec - 31 Dec	LOT
23 Dec - 29 Dec	KLM
25 Dec - 31 Dec	Finnair

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 401€

Return flights