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

Return flights

30 Sep - 27 Oct	Wizz Air
07 Sep - 18 Sep	Wizz Air
03 Sep - 18 Sep	Wizz Air
07 Sep - 12 Oct	Wizz Air
20 Sep - 23 Sep	Wizz Air
15 Sep - 23 Sep	Fly One
03 Sep - 17 Sep	Wizz Air
02 Sep - 17 Sep	Wizz Air
06 Sep - 16 Sep	Wizz Air
03 Sep - 16 Sep	Wizz Air
10 Sep - 16 Sep	Wizz Air
04 Sep - 11 Sep	Wizz Air
17 Sep - 08 Oct	Wizz Air
16 Sep - 07 Oct	Wizz Air
29 Sep - 27 Oct	Wizz Air UK
30 Sep - 07 Oct	Ryanair
30 Sep - 20 Oct	Wizz Air
29 Sep - 11 Oct	Wizz Air
30 Sep - 13 Oct	easyJet
30 Sep - 23 Oct	Ryanair

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 586€

Return flights