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

Return flights

21 Sep - 09 Oct	Air China
21 Sep - 15 Oct	Air China
20 Sep - 15 Oct	Air China
14 Sep - 14 Oct	China Southern
19 Sep - 28 Sep	Air China
15 Sep - 30 Sep	Air China
24 Sep - 08 Oct	China Southern
18 Sep - 04 Oct	China Southern
17 Sep - 05 Oct	China Southern
06 Sep - 16 Sep	Wizz Air UK
15 Sep - 01 Oct	Turkish Airlines
15 Sep - 28 Sep	Turkish Airlines
12 Sep - 21 Sep	Ryanair
18 Sep - 25 Sep	Turkish Airlines
19 Sep - 29 Sep	Ryanair
13 Sep - 25 Sep	Turkish Airlines
19 Sep - 02 Oct	easyJet
07 Sep - 16 Sep	Air China
08 Sep - 16 Sep	Air China
12 Sep - 03 Oct	easyJet

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 $626

Return flights