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

Return flights

10 Dec - 26 Dec	SunExpress
31 Dec - 23 Jan	China Eastern
28 Dec - 20 Jan	Wizz Air UK
31 Dec - 21 Jan	Vueling Airlines
10 Dec - 28 Dec	SunExpress
28 Dec - 19 Jan	Wizz Air UK
10 Dec - 20 Dec	SunExpress
10 Dec - 21 Jan	Wizz Air
30 Dec - 20 Jan	China Southern
11 Dec - 24 Dec	easyJet
11 Dec - 14 Dec	easyJet
11 Dec - 13 Dec	easyJet
11 Dec - 20 Dec	easyJet
15 Dec - 25 Dec	easyJet
30 Dec - 30 Jan	China Southern
28 Dec - 12 Jan	Wizz Air UK
10 Dec - 18 Dec	Wizz Air
28 Dec - 15 Jan	Wizz Air UK
31 Dec - 15 Jan	Vueling Airlines
11 Dec - 23 Dec	easyJet

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 $649

Return flights