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

Return flights

02 Sep - 09 Sep	easyJet
23 Sep - 14 Oct	Wizz Air
02 Sep - 10 Sep	Wizz Air
10 Sep - 23 Sep	easyJet
01 Sep - 10 Sep	easyJet
02 Sep - 11 Sep	Wizz Air
02 Sep - 08 Sep	easyJet
03 Sep - 11 Sep	Wizz Air
13 Sep - 23 Sep	Wizz Air
29 Sep - 16 Oct	Fly One
29 Sep - 14 Oct	Fly One
18 Sep - 23 Sep	Wizz Air
13 Sep - 24 Sep	Wizz Air
30 Sep - 09 Oct	Wizz Air UK
30 Sep - 14 Oct	Wizz Air UK
20 Sep - 07 Oct	Wizz Air
24 Sep - 08 Oct	Wizz Air
23 Sep - 07 Oct	Wizz Air
29 Sep - 08 Oct	Ryanair
19 Sep - 10 Oct	easyJet

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 501€

Return flights