AirHint found the following cheapest return flights from London (LGW) to Seoul (ICN) in September 2026 (see full year).

Return flights

20 Sep - 03 Oct	Air China
10 Sep - 22 Oct	China Southern
21 Sep - 11 Oct	China Southern
21 Sep - 12 Oct	China Southern
25 Sep - 11 Oct	China Southern
25 Sep - 12 Oct	China Southern
10 Sep - 11 Oct	China Southern
14 Sep - 12 Oct	China Southern
12 Sep - 03 Oct	Turkish Airlines
17 Sep - 19 Oct	China Southern
15 Sep - 23 Sep	Air China
13 Sep - 30 Sep	Wizz Air UK
01 Sep - 09 Sep	SWISS
15 Sep - 30 Sep	Air China
13 Sep - 28 Sep	Wizz Air UK
04 Sep - 28 Sep	Wizz Air UK
01 Sep - 28 Sep	SWISS
20 Sep - 28 Sep	SWISS
13 Sep - 26 Sep	Turkish Airlines
15 Sep - 29 Sep	Norwegian Air Sweden AOC

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 $705

Return flights