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

Return flights

18 Aug - 25 Aug	China Eastern
05 Aug - 01 Sep	China Eastern
06 Aug - 24 Sep	China Eastern
04 Aug - 11 Aug	China Eastern
05 Aug - 25 Sep	China Eastern
19 Aug - 05 Sep	Air China
18 Aug - 10 Sep	Air China
17 Aug - 03 Sep	Air China
18 Aug - 07 Sep	Air China
18 Aug - 23 Aug	Air China
19 Aug - 31 Aug	Air China
18 Aug - 26 Aug	Air China
18 Aug - 08 Sep	Air China
07 Aug - 14 Aug	China Eastern
17 Aug - 25 Aug	Air China
13 Aug - 17 Aug	China Eastern
13 Aug - 03 Sep	China Eastern
13 Aug - 10 Sep	China Eastern
18 Aug - 24 Aug	China Eastern
13 Aug - 30 Aug	China Eastern

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 553€

Return flights