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

Return flights

10 Sep - 17 Sep	Air China
08 Sep - 14 Sep	China Southern
10 Sep - 15 Sep	China Eastern
08 Sep - 16 Sep	China Eastern
10 Sep - 18 Sep	Air China
18 Sep - 27 Sep	China Eastern
18 Sep - 29 Sep	China Eastern
17 Sep - 23 Sep	China Eastern
11 Sep - 18 Sep	Asiana Airlines
22 Sep - 30 Sep	Emirates
24 Sep - 02 Oct	Emirates
24 Sep - 05 Oct	Emirates
21 Sep - 14 Oct	Asiana Airlines
30 Sep - 03 Oct	Jeju Air
23 Sep - 01 Oct	Emirates
23 Sep - 03 Oct	Emirates
24 Sep - 16 Oct	Emirates
24 Sep - 15 Oct	Emirates
22 Sep - 05 Oct	Emirates
23 Sep - 23 Oct	Emirates

Also check the deals for one-way flights from Seoul to London 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 Seoul to London in September from 583€

Return flights