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

Return flights

18 Sep - 21 Sep	China Eastern
21 Sep - 24 Sep	China Eastern
10 Sep - 16 Sep	China Eastern
09 Sep - 20 Sep	China Eastern
04 Sep - 14 Oct	Asiana Airlines
10 Sep - 18 Sep	China Eastern
12 Sep - 14 Sep	China Eastern
21 Sep - 23 Sep	China Eastern
07 Sep - 19 Sep	China Eastern
03 Sep - 09 Sep	China Southern
13 Sep - 20 Sep	China Eastern
28 Sep - 19 Oct	HK Express
09 Sep - 01 Oct	Air China
24 Sep - 01 Oct	Emirates
23 Sep - 02 Oct	Emirates
12 Sep - 01 Oct	Air China
24 Sep - 04 Oct	Emirates
24 Sep - 05 Oct	Emirates
01 Sep - 01 Oct	China Southern
25 Sep - 02 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 479€

Return flights