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

Return flights

02 Sep - 23 Oct	Air China
02 Sep - 21 Oct	Air China
18 Sep - 11 Oct	Air China
15 Sep - 16 Oct	Air China
05 Sep - 11 Oct	Air China
18 Sep - 12 Oct	Air China
10 Sep - 13 Oct	Air China
11 Sep - 12 Oct	Air China
15 Sep - 15 Oct	Air China
18 Sep - 18 Oct	Air China
01 Sep - 16 Sep	Wizz Air Malta
17 Sep - 24 Sep	Wizz Air Malta
15 Sep - 18 Sep	Wizz Air UK
01 Sep - 18 Sep	Wizz Air UK
13 Sep - 18 Sep	Wizz Air UK
02 Sep - 16 Sep	Wizz Air Malta
01 Sep - 08 Sep	Wizz Air UK
16 Sep - 18 Sep	Vueling Airlines
18 Sep - 24 Sep	Wizz Air Malta
01 Sep - 15 Sep	China Southern

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 396€

Return flights