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

Return flights

10 Jul - 12 Aug	Turkish Airlines
10 Jul - 13 Aug	Turkish Airlines
10 Jul - 24 Jul	Air China
10 Jul - 08 Aug	Air China
31 Jul - 20 Aug	Lufthansa
21 Jul - 27 Jul	Lufthansa
10 Jul - 27 Jul	Air China
09 Jul - 17 Jul	Lufthansa
20 Jul - 30 Jul	Lufthansa
11 Jul - 16 Jul	Lufthansa
10 Jul - 16 Jul	Air China
10 Jul - 31 Jul	Etihad Airways
10 Jul - 20 Jul	British Airways
28 Jul - 20 Aug	KM Malta Airlines
10 Jul - 03 Aug	Air China
31 Jul - 13 Aug	KLM
21 Jul - 09 Aug	LOT
16 Jul - 31 Jul	Lufthansa
22 Jul - 13 Aug	Air India
29 Jul - 20 Aug	Air India

Also check the deals for one-way flights from London to Seoul 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 London to Seoul in July from 723€

Return flights