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

Return flights

28 Sep - 11 Oct	easyJet
01 Sep - 09 Oct	Wizz Air UK
01 Sep - 09 Sep	Wizz Air UK
01 Sep - 05 Sep	Wizz Air UK
15 Sep - 18 Sep	Wizz Air UK
01 Sep - 25 Sep	Wizz Air UK
11 Sep - 19 Sep	easyJet
03 Sep - 19 Sep	easyJet
26 Sep - 11 Oct	Ryanair
01 Sep - 17 Sep	Wizz Air
01 Sep - 10 Sep	Wizz Air
27 Sep - 12 Oct	Ryanair
01 Sep - 18 Sep	Wizz Air
01 Sep - 11 Sep	Wizz Air
27 Sep - 11 Oct	Wizz Air UK
08 Sep - 09 Oct	Wizz Air
09 Sep - 15 Oct	easyJet
25 Sep - 10 Oct	easyJet
28 Sep - 14 Oct	easyJet
22 Sep - 08 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 $941

Return flights