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

Return flights

29 Sep - 16 Oct	Wizz Air UK
01 Sep - 09 Sep	Wizz Air UK
01 Sep - 16 Sep	Wizz Air UK
03 Sep - 12 Sep	Wizz Air
15 Sep - 16 Oct	Wizz Air
18 Sep - 23 Sep	Wizz Air
04 Sep - 10 Sep	Wizz Air
08 Sep - 14 Sep	Wizz Air UK
08 Sep - 16 Sep	Wizz Air
15 Sep - 20 Oct	Wizz Air
06 Sep - 21 Sep	easyJet
10 Sep - 23 Sep	Wizz Air
08 Sep - 15 Sep	Wizz Air
08 Sep - 20 Oct	Wizz Air
18 Sep - 16 Oct	Wizz Air
26 Sep - 17 Oct	Wizz Air
18 Sep - 07 Oct	Wizz Air
23 Sep - 07 Oct	Wizz Air
27 Sep - 20 Oct	Ryanair
24 Sep - 07 Oct	Wizz Air

Also check the deals for one-way flights from London to Seoul in September.

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 September from 597€

Return flights