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

Return flights

10 Dec - 27 Dec	Air China
02 Dec - 08 Dec	Air France
02 Dec - 09 Dec	Air France
03 Dec - 10 Dec	Air France
08 Dec - 11 Dec	Air France
09 Dec - 13 Jan	Air France
18 Dec - 24 Dec	China Southern
07 Dec - 11 Dec	Lufthansa
03 Dec - 07 Dec	Lufthansa
01 Dec - 01 Jan	Lufthansa
15 Dec - 08 Jan	Lufthansa
10 Dec - 16 Dec	Air China
01 Dec - 09 Dec	Air China
17 Dec - 03 Jan	Air China
01 Dec - 12 Jan	Lufthansa
15 Dec - 05 Jan	Air China
18 Dec - 03 Jan	Air China
11 Dec - 03 Jan	Air China
15 Dec - 09 Jan	Air China
12 Dec - 09 Jan	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 562€

Return flights