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

Return flights

24 Sep - 09 Oct	Pegasus Airlines
15 Sep - 30 Sep	Pegasus Airlines
24 Sep - 02 Oct	Pegasus Airlines
07 Sep - 05 Oct	Ryanair
21 Sep - 05 Oct	Ryanair
24 Sep - 16 Oct	Pegasus Airlines
20 Sep - 01 Oct	Pegasus Airlines
24 Sep - 20 Oct	Pegasus Airlines
16 Sep - 06 Oct	Ryanair
12 Sep - 30 Sep	Ryanair
21 Sep - 30 Sep	Ryanair
10 Sep - 28 Sep	Pegasus Airlines
07 Sep - 12 Oct	Ryanair
16 Sep - 30 Sep	Ryanair
23 Sep - 01 Oct	Ryanair
15 Sep - 29 Sep	Pegasus Airlines
17 Sep - 30 Sep	Ryanair
07 Sep - 16 Sep	Ryanair
16 Sep - 29 Sep	Ryanair
10 Sep - 30 Sep	Ryanair

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 624€

Return flights