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

Return flights

03 Sep - 11 Sep	Wizz Air
01 Sep - 11 Sep	Wizz Air
07 Sep - 18 Sep	Wizz Air
04 Sep - 11 Sep	Wizz Air
07 Sep - 14 Sep	Wizz Air
13 Sep - 21 Sep	Wizz Air
11 Sep - 14 Sep	Wizz Air
08 Sep - 14 Sep	Wizz Air
06 Sep - 14 Sep	Wizz Air
01 Sep - 14 Sep	Wizz Air
17 Sep - 07 Oct	Wizz Air
22 Sep - 07 Oct	Wizz Air
24 Sep - 21 Oct	easyJet
16 Sep - 08 Oct	Wizz Air
15 Sep - 07 Oct	easyJet
30 Sep - 13 Oct	Ryanair
25 Sep - 08 Oct	Wizz Air
29 Sep - 14 Oct	Ryanair
27 Sep - 07 Oct	Ryanair
20 Sep - 04 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 587€

Return flights