AirHint found the following cheapest return flights from London (LCY) to Istanbul (IST) in August 2025 (see full year).

Return flights

29 Aug - 16 Sep	Lufthansa
26 Aug - 09 Sep	Lufthansa
20 Aug - 09 Sep	Lufthansa
20 Aug - 19 Sep	Lufthansa
28 Aug - 15 Sep	Lufthansa
27 Aug - 15 Sep	Lufthansa
28 Aug - 04 Sep	SWISS
21 Aug - 11 Sep	Lufthansa
26 Aug - 12 Sep	Lufthansa
25 Aug - 08 Sep	Lufthansa
16 Aug - 27 Aug	KLM
16 Aug - 28 Aug	KLM
19 Aug - 26 Aug	SWISS
14 Aug - 21 Aug	SWISS
18 Aug - 22 Aug	British Airways
13 Aug - 20 Aug	SWISS
13 Aug - 19 Aug	Lufthansa
14 Aug - 19 Aug	SWISS
13 Aug - 18 Aug	SWISS
14 Aug - 27 Aug	SWISS

Also check the deals for one-way flights from London to Istanbul 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 Istanbul in August from $350

Return flights