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

Return flights

27 Aug - 17 Sep	KLM
31 Aug - 24 Sep	KLM
26 Aug - 24 Sep	KLM
27 Aug - 03 Sep	KLM
20 Aug - 24 Sep	KLM
20 Aug - 14 Sep	KLM
31 Aug - 14 Sep	KLM
27 Aug - 14 Sep	KLM
20 Aug - 04 Sep	British Airways
31 Aug - 11 Sep	KLM
20 Aug - 26 Aug	KLM
13 Aug - 19 Aug	British Airways
19 Aug - 26 Aug	SWISS
08 Aug - 19 Aug	KLM
14 Aug - 19 Aug	British Airways
25 Aug - 31 Aug	Lufthansa
12 Aug - 19 Aug	British Airways
19 Aug - 27 Aug	SWISS
18 Aug - 25 Aug	SWISS
21 Aug - 28 Aug	British Airways

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 $894

Return flights