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

Return flights

06 Dec - 13 Dec	Air China
21 Dec - 12 Jan	Air China
15 Dec - 04 Jan	China Eastern
18 Dec - 25 Dec	Air China
13 Dec - 19 Dec	Air China
14 Dec - 21 Dec	Air China
19 Dec - 31 Dec	China Eastern
10 Dec - 22 Dec	Air China
19 Dec - 25 Dec	China Eastern
08 Dec - 12 Dec	T'way Air
06 Dec - 14 Dec	T'way Air
04 Dec - 09 Dec	T'way Air
24 Dec - 04 Jan	Air France
13 Dec - 04 Jan	Air France
22 Dec - 04 Jan	Air France
29 Dec - 02 Jan	Air China
30 Dec - 04 Jan	Air France
21 Dec - 04 Jan	Air France
15 Dec - 05 Jan	LOT
25 Dec - 09 Jan	Asiana Airlines

Also check the deals for one-way flights from Seoul to London 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 Seoul to London in December from $445

Return flights