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

Return flights

30 Dec - 23 Jan	Air France
30 Dec - 15 Jan	Air France
31 Dec - 22 Jan	Hainan Airlines
31 Dec - 25 Jan	Hainan Airlines
30 Dec - 25 Jan	Air France
30 Dec - 22 Jan	Air France
29 Dec - 30 Jan	KLM
29 Dec - 25 Jan	Air France
29 Dec - 29 Jan	Hainan Airlines
09 Dec - 17 Dec	Scandinavian Airlines
25 Dec - 30 Jan	Air China
07 Dec - 13 Dec	British Airways
07 Dec - 15 Dec	British Airways
07 Dec - 21 Dec	British Airways
07 Dec - 14 Dec	British Airways
07 Dec - 16 Dec	British Airways
07 Dec - 22 Dec	British Airways
10 Dec - 13 Dec	SWISS
08 Dec - 14 Dec	KLM
08 Dec - 15 Dec	Air France

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 464€

Return flights