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

Return flights

25 Sep - 09 Oct	Ryanair
25 Sep - 28 Oct	Ryanair
25 Sep - 08 Oct	Ryanair
29 Sep - 12 Oct	easyJet
22 Sep - 27 Sep	Wizz Air
30 Sep - 21 Oct	easyJet
23 Sep - 28 Oct	Wizz Air
28 Sep - 13 Oct	easyJet
28 Sep - 09 Oct	easyJet
29 Sep - 10 Oct	easyJet
22 Sep - 28 Oct	easyJet
19 Sep - 26 Sep	easyJet
21 Sep - 28 Sep	easyJet
18 Sep - 29 Sep	easyJet
17 Sep - 29 Sep	easyJet
20 Sep - 27 Sep	easyJet
24 Sep - 25 Sep	easyJet
22 Sep - 29 Sep	Wizz Air
24 Sep - 29 Sep	easyJet
17 Sep - 25 Sep	Wizz Air UK

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 $780

Return flights