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

Return flights

10 Dec - 18 Dec	Lufthansa
01 Dec - 07 Dec	KLM
03 Dec - 12 Dec	KLM
01 Dec - 05 Dec	KLM
08 Dec - 14 Dec	KLM
03 Dec - 11 Dec	KLM
04 Dec - 13 Dec	KLM
31 Dec - 18 Jan	KLM
23 Dec - 31 Dec	ITA Airways
05 Dec - 13 Dec	KLM
15 Dec - 15 Jan	KLM
24 Dec - 01 Jan	Lufthansa
26 Dec - 08 Jan	ITA Airways
16 Dec - 12 Jan	British Airways
16 Dec - 06 Jan	British Airways
02 Dec - 12 Dec	British Airways
28 Dec - 07 Jan	British Airways
24 Dec - 07 Jan	British Airways
23 Dec - 02 Jan	KLM
29 Dec - 04 Jan	British Airways

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 $832

Return flights