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

Return flights

31 Dec - 29 Jan	Air China
31 Dec - 22 Jan	Air China
30 Dec - 25 Jan	China Southern
25 Dec - 20 Jan	Air China
31 Dec - 31 Jan	Air China
30 Dec - 20 Jan	AJet
29 Dec - 25 Jan	Hainan Airlines
27 Dec - 20 Jan	Air China
29 Dec - 14 Jan	Hainan Airlines
25 Dec - 19 Jan	Air China
25 Dec - 29 Dec	Air China
25 Dec - 30 Dec	Air China
25 Dec - 31 Dec	Air China
24 Dec - 27 Dec	Hainan Airlines
23 Dec - 27 Dec	Ryanair
24 Dec - 31 Dec	Hainan Airlines
26 Dec - 31 Dec	KLM
23 Dec - 25 Dec	easyJet
23 Dec - 30 Dec	Ryanair
23 Dec - 31 Dec	Ryanair

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 439€

Return flights