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

Return flights

22 Sep - 09 Oct	Wizz Air
29 Sep - 09 Oct	Wizz Air
22 Sep - 08 Oct	Wizz Air
22 Sep - 10 Oct	Wizz Air
24 Sep - 11 Oct	Wizz Air UK
22 Sep - 07 Oct	Wizz Air
29 Sep - 14 Oct	Fly One
22 Sep - 29 Sep	Wizz Air
23 Sep - 28 Oct	Ryanair
27 Sep - 08 Oct	Ryanair
30 Sep - 07 Oct	Ryanair
22 Sep - 25 Sep	Wizz Air
22 Sep - 28 Sep	Wizz Air
23 Sep - 29 Sep	Ryanair
22 Sep - 23 Sep	easyJet
21 Sep - 26 Sep	easyJet
25 Sep - 30 Sep	easyJet
25 Sep - 28 Sep	easyJet
24 Sep - 30 Sep	easyJet
24 Sep - 29 Sep	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 540€

Return flights