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

Return flights

02 Dec - 24 Dec	Air China
01 Dec - 23 Dec	Air China
05 Dec - 18 Dec	Air China
01 Dec - 08 Dec	Air China
01 Dec - 05 Dec	Air China
01 Dec - 14 Dec	Air China
04 Dec - 11 Dec	Air China
01 Dec - 11 Dec	Air China
01 Dec - 14 Jan	Air China
04 Dec - 21 Dec	Air China
04 Dec - 22 Dec	Air China
28 Dec - 14 Jan	Air China
28 Dec - 30 Jan	Air China
31 Dec - 14 Jan	Lufthansa
08 Dec - 14 Jan	Lufthansa
04 Dec - 20 Jan	Air China
30 Dec - 25 Jan	Lufthansa
31 Dec - 25 Jan	Lufthansa
24 Dec - 12 Jan	Lufthansa
25 Dec - 14 Jan	Lufthansa

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 $504

Return flights