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

Return flights

03 Dec - 20 Dec	Pegasus Airlines
07 Dec - 13 Dec	Jet2
07 Dec - 16 Dec	Jet2
03 Dec - 17 Dec	Pegasus Airlines
02 Dec - 12 Dec	Ryanair
07 Dec - 21 Dec	Jet2
01 Dec - 22 Dec	Ryanair
06 Dec - 19 Dec	AJet
30 Dec - 14 Jan	Ryanair
01 Dec - 08 Dec	Ryanair
01 Dec - 07 Dec	Ryanair
29 Dec - 15 Jan	Ryanair
16 Dec - 07 Jan	Ryanair
06 Dec - 03 Jan	AJet
30 Dec - 06 Jan	Ryanair
13 Dec - 10 Jan	Ryanair
11 Dec - 10 Jan	Ryanair
16 Dec - 06 Jan	Ryanair
26 Dec - 08 Jan	Ryanair
30 Dec - 03 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 575€

Return flights