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

Return flights

27 Aug - 03 Sep	Air China
22 Aug - 30 Aug	Air China
25 Aug - 01 Sep	Air China
24 Aug - 21 Sep	Air China
28 Aug - 30 Aug	Air China
27 Aug - 31 Aug	Air China
25 Aug - 31 Aug	Air China
27 Aug - 04 Sep	Air China
24 Aug - 08 Sep	Air China
18 Aug - 24 Aug	Air China
15 Aug - 20 Aug	Air China
14 Aug - 19 Aug	Air China
11 Aug - 26 Aug	Air China
11 Aug - 19 Aug	Air China
11 Aug - 17 Aug	Air China
31 Aug - 04 Sep	Air China
26 Aug - 05 Sep	Air China
31 Aug - 05 Sep	Air China
26 Aug - 02 Sep	Air China
29 Aug - 05 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 $742

Return flights