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

Return flights

22 Sep - 07 Oct	Lufthansa
16 Sep - 14 Oct	Lufthansa
16 Sep - 07 Oct	Lufthansa
14 Sep - 05 Oct	Lufthansa
08 Sep - 15 Sep	Lufthansa
22 Sep - 06 Oct	Lufthansa
15 Sep - 23 Sep	Air China
07 Sep - 21 Sep	Air China
09 Sep - 21 Sep	Air China
14 Sep - 21 Sep	Air China
10 Sep - 15 Sep	Lufthansa
07 Sep - 14 Sep	Air China
08 Sep - 21 Sep	Air China
21 Sep - 12 Oct	Air China
06 Sep - 14 Sep	Lufthansa
19 Sep - 11 Oct	Air China
03 Sep - 16 Sep	Lufthansa
09 Sep - 10 Oct	Air China
18 Sep - 02 Oct	Etihad Airways
24 Sep - 24 Oct	Air China

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 503€

Return flights