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

Return flights

15 Sep - 15 Oct	Lufthansa
28 Sep - 13 Oct	Air China
17 Sep - 11 Oct	Air China
26 Sep - 10 Oct	Air China
19 Sep - 10 Oct	Air China
19 Sep - 11 Oct	Air China
07 Sep - 14 Sep	Lufthansa
06 Sep - 14 Sep	Lufthansa
07 Sep - 15 Sep	Lufthansa
01 Sep - 14 Sep	SWISS
14 Sep - 28 Sep	Lufthansa
02 Sep - 14 Sep	Lufthansa
08 Sep - 17 Sep	Lufthansa
16 Sep - 30 Sep	Air India
23 Sep - 30 Sep	Air India
01 Sep - 30 Sep	Air India
24 Sep - 11 Oct	China Southern
22 Sep - 01 Oct	Air India
22 Sep - 02 Oct	Air India
17 Sep - 02 Oct	Air India

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 $604

Return flights