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

Return flights

25 Aug - 17 Sep	KLM
30 Aug - 14 Sep	KLM
27 Aug - 04 Sep	KLM
28 Aug - 12 Sep	KLM
29 Aug - 08 Sep	KLM
20 Aug - 11 Sep	ITA Airways
26 Aug - 03 Sep	KLM
29 Aug - 14 Sep	KLM
19 Aug - 28 Aug	KLM
30 Aug - 05 Sep	KLM
28 Aug - 16 Sep	British Airways
19 Aug - 27 Aug	KLM
20 Aug - 24 Aug	British Airways
19 Aug - 24 Aug	KLM
21 Aug - 26 Aug	KLM
18 Aug - 27 Aug	British Airways
25 Aug - 27 Aug	British Airways
18 Aug - 24 Aug	British Airways
21 Aug - 27 Aug	British Airways
20 Aug - 31 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 840€

Return flights