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

Return flights

15 Sep - 20 Oct	Air China
17 Sep - 22 Oct	Air China
18 Sep - 12 Oct	Air China
15 Sep - 16 Oct	Air China
16 Sep - 15 Oct	Air China
14 Sep - 12 Oct	Air China
15 Sep - 15 Oct	Air China
18 Sep - 18 Oct	Air China
09 Sep - 15 Oct	Air China
09 Sep - 13 Oct	Air China
01 Sep - 11 Sep	China Southern
02 Sep - 06 Sep	Air China
16 Sep - 21 Sep	Wizz Air UK
14 Sep - 21 Sep	Vueling Airlines
02 Sep - 11 Sep	Vueling Airlines
01 Sep - 15 Sep	Norwegian
01 Sep - 13 Sep	China Eastern
11 Sep - 18 Sep	China Southern
12 Sep - 17 Sep	China Southern
12 Sep - 21 Sep	Vueling Airlines

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 438€

Return flights