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

Return flights

01 Dec - 08 Dec	China Southern
02 Dec - 16 Dec	Air China
03 Dec - 17 Dec	Air China
02 Dec - 07 Dec	Air China
02 Dec - 14 Dec	Air China
03 Dec - 21 Dec	Air China
02 Dec - 28 Dec	Air China
27 Dec - 24 Jan	Air China
12 Dec - 19 Dec	China Southern
06 Dec - 10 Dec	Air China
23 Dec - 28 Dec	Air China
01 Dec - 14 Jan	Japan Airlines
03 Dec - 04 Jan	Air China
08 Dec - 05 Jan	Air China
05 Dec - 05 Jan	Air China
27 Dec - 11 Jan	Air China
24 Dec - 06 Jan	Air China
15 Dec - 14 Jan	Air China
26 Dec - 16 Jan	ANA
26 Dec - 05 Jan	Air China

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 $621

Return flights