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

Return flights

01 Dec - 07 Dec	China Eastern
01 Dec - 12 Dec	China Eastern
01 Dec - 09 Dec	China Eastern
01 Dec - 10 Dec	China Eastern
01 Dec - 14 Dec	China Eastern
01 Dec - 08 Dec	China Eastern
01 Dec - 23 Dec	China Eastern
01 Dec - 22 Dec	China Eastern
01 Dec - 17 Dec	China Eastern
01 Dec - 16 Dec	China Eastern
08 Dec - 14 Jan	Lufthansa
30 Dec - 14 Jan	Lufthansa
31 Dec - 28 Jan	Lufthansa
28 Dec - 23 Jan	Air China
30 Dec - 19 Jan	Lufthansa
30 Dec - 25 Jan	Lufthansa
31 Dec - 25 Jan	Lufthansa
03 Dec - 16 Jan	Lufthansa
25 Dec - 14 Jan	Air China
05 Dec - 16 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 374€

Return flights