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

Return flights

31 Dec - 31 Jan	KLM
26 Dec - 22 Jan	KLM
31 Dec - 18 Jan	KLM
29 Dec - 20 Jan	KLM
26 Dec - 14 Jan	KLM
26 Dec - 17 Jan	KLM
30 Dec - 20 Jan	KLM
26 Dec - 30 Dec	KLM
26 Dec - 15 Jan	KLM
12 Dec - 28 Dec	KLM
27 Dec - 18 Jan	KLM
24 Dec - 30 Dec	KLM
24 Dec - 17 Jan	KLM
12 Dec - 27 Dec	KLM
12 Dec - 30 Dec	KLM
12 Dec - 21 Dec	KLM
12 Dec - 23 Dec	KLM
12 Dec - 20 Dec	KLM
14 Dec - 21 Dec	SWISS
12 Dec - 14 Dec	KLM

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 $873

Return flights