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

Return flights

05 Dec - 10 Dec	Ryanair
07 Dec - 14 Jan	Ryanair
06 Dec - 10 Dec	Ryanair
01 Dec - 07 Dec	Ryanair
06 Dec - 13 Dec	Ryanair
01 Dec - 13 Dec	Ryanair
01 Dec - 10 Dec	Ryanair
01 Dec - 14 Jan	Ryanair
07 Dec - 11 Dec	Ryanair
07 Dec - 14 Dec	Ryanair
06 Dec - 14 Dec	Ryanair
01 Dec - 12 Dec	Ryanair
11 Dec - 09 Jan	Ryanair
11 Dec - 11 Jan	Ryanair
05 Dec - 11 Jan	Ryanair
11 Dec - 10 Jan	Ryanair
10 Dec - 18 Jan	Ryanair
10 Dec - 16 Jan	Ryanair
10 Dec - 24 Jan	Ryanair
10 Dec - 01 Jan	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 428€

Return flights