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

Return flights

23 Sep - 13 Oct	Ryanair
03 Sep - 17 Sep	Ryanair
03 Sep - 16 Sep	Ryanair
21 Sep - 05 Oct	Ryanair
22 Sep - 01 Oct	Ryanair
17 Sep - 25 Sep	Turkish Airlines
05 Sep - 18 Sep	Ryanair
17 Sep - 04 Oct	Ryanair
27 Sep - 14 Oct	Ryanair
17 Sep - 24 Sep	Turkish Airlines
02 Sep - 14 Sep	Ryanair
01 Sep - 29 Sep	Ryanair
02 Sep - 11 Sep	Ryanair
21 Sep - 04 Oct	Ryanair
14 Sep - 24 Sep	Turkish Airlines
11 Sep - 22 Sep	Turkish Airlines
17 Sep - 03 Oct	Turkish Airlines
24 Sep - 08 Oct	Ryanair
27 Sep - 17 Oct	Turkish Airlines
20 Sep - 10 Oct	Turkish Airlines

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 $764

Return flights