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

Return flights

23 Aug - 03 Sep	China Southern
13 Aug - 01 Sep	China Southern
19 Aug - 19 Sep	China Southern
12 Aug - 24 Aug	China Eastern
07 Aug - 17 Aug	China Eastern
19 Aug - 07 Sep	China Southern
11 Aug - 17 Aug	China Eastern
19 Aug - 26 Aug	China Eastern
18 Aug - 21 Aug	Air China
19 Aug - 05 Sep	Air China
23 Aug - 30 Aug	Air China
25 Aug - 03 Sep	Air China
05 Aug - 09 Sep	China Southern
18 Aug - 22 Aug	Air China
23 Aug - 29 Aug	Air China
20 Aug - 05 Sep	Air China
24 Aug - 29 Aug	Air China
18 Aug - 18 Aug	Air China
24 Aug - 06 Sep	Air China
20 Aug - 03 Sep	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 583€

Return flights