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

Return flights

31 Jul - 07 Aug	MIAT Mongolian Airlines
30 Jul - 25 Aug	SWISS
29 Jul - 19 Aug	Air France
31 Jul - 21 Aug	Air France
29 Jul - 13 Aug	Air China
31 Jul - 13 Aug	Air France
31 Jul - 18 Aug	Air France
30 Jul - 24 Aug	SWISS
30 Jul - 13 Aug	EVA Air
30 Jul - 14 Aug	EVA Air
27 Jul - 29 Jul	Lufthansa
28 Jul - 30 Jul	Lufthansa
27 Jul - 30 Jul	Lufthansa
28 Jul - 31 Jul	Air China
29 Jul - 30 Jul	Lufthansa
29 Jul - 31 Jul	Air China
27 Jul - 31 Jul	Lufthansa
28 Jul - 31 Jul	Korean Air	direct

Also check the deals for one-way flights from Seoul to London in July.

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 July from 672€

Return flights