AirHint found the following cheapest return flights from London (STN) to Seoul (ICN) in September 2025 (see full year).

Return flights

10 Sep - 17 Sep	Ryanair
08 Sep - 15 Sep	Ryanair
09 Sep - 17 Sep	Ryanair
16 Sep - 23 Sep	Ryanair
01 Sep - 10 Sep	Ryanair
01 Sep - 15 Sep	Ryanair
16 Sep - 24 Sep	Ryanair
01 Sep - 14 Sep	Ryanair
08 Sep - 17 Sep	Ryanair
10 Sep - 24 Sep	Ryanair
22 Sep - 07 Oct	Ryanair
15 Sep - 16 Oct	Ryanair
27 Sep - 14 Oct	Ryanair
08 Sep - 14 Oct	Ryanair
29 Sep - 16 Oct	Ryanair
24 Sep - 20 Oct	Ryanair
28 Sep - 15 Oct	Ryanair
19 Sep - 13 Oct	Ryanair
29 Sep - 13 Oct	Ryanair
30 Sep - 14 Oct	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 552€

Return flights