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

Return flights

14 Sep - 01 Oct	Air China
07 Sep - 11 Sep	Air China
12 Sep - 16 Sep	Air China
07 Sep - 14 Sep	Air China
11 Sep - 21 Sep	Air China
16 Sep - 23 Sep	Air China
12 Sep - 18 Sep	Air China
01 Sep - 07 Sep	Finnair
15 Sep - 22 Sep	Finnair
08 Sep - 20 Sep	Finnair
15 Sep - 20 Sep	Finnair
28 Sep - 05 Oct	Finnair
27 Sep - 10 Oct	Finnair
27 Sep - 09 Oct	Malaysia Airlines
24 Sep - 01 Oct	Oman Air
20 Sep - 04 Oct	Vietnam Airlines
30 Sep - 05 Oct	Etihad Airways
24 Sep - 04 Oct	Air Astana
19 Sep - 03 Oct	Air China
30 Sep - 07 Oct	Vietnam 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 588€

Return flights