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

Return flights

19 Sep - 11 Oct	Air China
25 Sep - 14 Oct	Air China
21 Sep - 12 Oct	Air China
16 Sep - 07 Oct	Air China
14 Sep - 05 Oct	Air China
25 Sep - 16 Oct	Air China
29 Sep - 18 Oct	Air China
25 Sep - 10 Oct	Air China
19 Sep - 30 Sep	Norwegian Air Sweden AOC
07 Sep - 14 Sep	Air China
05 Sep - 14 Sep	Ryanair
08 Sep - 16 Sep	Air China
14 Sep - 21 Sep	Air China
15 Sep - 23 Sep	Air China
07 Sep - 21 Sep	Air China
17 Sep - 28 Sep	Air China
09 Sep - 16 Sep	Norwegian Air Sweden AOC
16 Sep - 27 Sep	Air China
21 Sep - 06 Oct	Air China
22 Sep - 06 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 499€

Return flights