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

Return flights

11 Sep - 18 Sep	Air China
11 Sep - 19 Sep	Air China
09 Sep - 16 Sep	Air China
05 Sep - 12 Sep	Air China
07 Sep - 12 Sep	Air China
02 Sep - 16 Sep	Air China
05 Sep - 10 Sep	Air China
12 Sep - 28 Sep	Air China
12 Sep - 19 Sep	Air China
07 Sep - 16 Sep	Air China
14 Sep - 02 Oct	Air China
14 Sep - 15 Oct	Air China
29 Sep - 10 Oct	Finnair
15 Sep - 07 Oct	Etihad Airways
01 Sep - 06 Oct	Finnair
01 Sep - 12 Oct	Finnair
30 Sep - 10 Oct	Malaysia Airlines
24 Sep - 04 Oct	Etihad Airways
24 Sep - 11 Oct	Air Astana
23 Sep - 06 Oct	Malaysia Airlines

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 $708

Return flights