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

Return flights

30 Aug - 12 Sep	China Eastern
22 Aug - 22 Sep	easyJet
29 Aug - 07 Sep	China Eastern
29 Aug - 01 Sep	China Eastern
31 Aug - 17 Sep	China Eastern
26 Aug - 01 Sep	China Eastern
26 Aug - 02 Sep	China Eastern
31 Aug - 15 Sep	China Eastern
30 Aug - 05 Sep	China Eastern
27 Aug - 02 Sep	China Eastern
28 Aug - 31 Aug	Air China
19 Aug - 29 Aug	Ryanair
25 Aug - 31 Aug	Air China
25 Aug - 28 Aug	Air China
13 Aug - 18 Aug	Norwegian
04 Aug - 17 Aug	Wizz Air UK
26 Aug - 30 Aug	Air China
23 Aug - 26 Aug	China Eastern
22 Aug - 30 Aug	Wizz Air Malta
21 Aug - 28 Aug	Wizz Air Malta

Also check the deals for one-way flights from London to Seoul 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 London to Seoul in August from 656€

Return flights