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

Return flights

26 Aug - 03 Sep	China Eastern
26 Aug - 31 Aug	China Eastern
26 Aug - 30 Aug	China Eastern
27 Aug - 31 Aug	Air China
18 Aug - 31 Aug	Air China
20 Aug - 27 Aug	Air China
20 Aug - 22 Sep	Air China
23 Aug - 27 Aug	Air China
24 Aug - 28 Aug	Air China
28 Aug - 31 Aug	Air China
24 Aug - 31 Aug	Air China
24 Aug - 29 Aug	Air China
27 Aug - 07 Sep	Air China
27 Aug - 08 Sep	Air China
27 Aug - 03 Sep	Air China
27 Aug - 06 Sep	Air China
21 Aug - 03 Sep	Air China
28 Aug - 02 Sep	Air China
28 Aug - 04 Sep	Air China
23 Aug - 06 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 577€

Return flights