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

Return flights

30 Dec - 07 Jan	Air France
30 Dec - 14 Jan	Air France
30 Dec - 08 Jan	Air France
31 Dec - 06 Jan	LOT
31 Dec - 07 Jan	LOT
30 Dec - 11 Jan	Finnair
31 Dec - 11 Jan	Lufthansa
31 Dec - 13 Jan	Lufthansa
31 Dec - 09 Jan	Lufthansa
31 Dec - 16 Jan	Lufthansa
30 Dec - 31 Dec	Asiana Airlines	direct
31 Dec - 31 Dec	Qatar Airways

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 $773

Return flights