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

Return flights

13 Aug - 20 Aug	LOT
14 Aug - 04 Sep	China Southern
13 Aug - 03 Sep	China Southern
13 Aug - 10 Sep	China Southern
26 Aug - 11 Sep	LOT
20 Aug - 22 Sep	LOT
19 Aug - 19 Sep	China Southern
17 Aug - 31 Aug	Shenzhen Airlines
28 Aug - 11 Sep	Shenzhen Airlines
18 Aug - 15 Sep	China Southern
18 Aug - 02 Sep	China Southern
21 Aug - 28 Aug	Shenzhen Airlines
17 Aug - 02 Sep	Shenzhen Airlines
05 Aug - 24 Aug	Etihad Airways
13 Aug - 30 Aug	LOT
12 Aug - 29 Aug	LOT
13 Aug - 31 Aug	LOT
19 Aug - 29 Aug	Shenzhen Airlines
07 Aug - 26 Aug	Etihad Airways
17 Aug - 21 Aug	Air China

Also check the deals for one-way flights from Seoul to London 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 Seoul to London in August from 571€

Return flights