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

Return flights

26 Aug - 09 Sep	Ryanair
31 Aug - 14 Sep	Ryanair
24 Aug - 09 Sep	Ryanair
30 Aug - 11 Sep	Ryanair
24 Aug - 10 Sep	easyJet
31 Aug - 09 Sep	Ryanair
26 Aug - 23 Sep	Ryanair
28 Aug - 19 Sep	Ryanair
18 Aug - 10 Sep	Ryanair
28 Aug - 23 Sep	Ryanair
24 Aug - 31 Aug	easyJet
26 Aug - 28 Aug	Ryanair
24 Aug - 27 Aug	easyJet
05 Aug - 12 Aug	Ryanair
24 Aug - 28 Aug	easyJet
29 Aug - 31 Aug	Ryanair
19 Aug - 27 Aug	Ryanair
20 Aug - 26 Aug	Ryanair
18 Aug - 26 Aug	Ryanair
25 Aug - 31 Aug	easyJet

Also check the deals for one-way flights from London to Seoul in August.

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 August from 583€

Return flights