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

Return flights

01 Dec - 10 Dec	Air China
05 Dec - 15 Dec	Air China
05 Dec - 11 Dec	Air China
05 Dec - 27 Dec	Air China
05 Dec - 19 Dec	Air China
01 Dec - 08 Dec	Air China
01 Dec - 19 Dec	Air China
02 Dec - 23 Dec	Air China
01 Dec - 11 Dec	Air China
02 Dec - 24 Dec	Air China
29 Dec - 17 Jan	Lufthansa
25 Dec - 16 Jan	Lufthansa
25 Dec - 17 Jan	Lufthansa
25 Dec - 12 Jan	Lufthansa
31 Dec - 12 Jan	Lufthansa
29 Dec - 07 Jan	Lufthansa
25 Dec - 01 Jan	Lufthansa
01 Dec - 01 Jan	Lufthansa
28 Dec - 25 Jan	Air China
24 Dec - 18 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 413€

Return flights