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

Return flights

25 Aug - 17 Sep	KLM
30 Aug - 17 Sep	Air France
29 Aug - 12 Sep	KLM
25 Aug - 16 Sep	KLM
31 Aug - 16 Sep	Air France
29 Aug - 24 Sep	KLM
27 Aug - 11 Sep	Air France
30 Aug - 21 Sep	Air France
29 Aug - 10 Sep	KLM
25 Aug - 12 Sep	KLM
18 Aug - 27 Aug	Turkish Airlines
18 Aug - 20 Aug	SWISS
16 Aug - 27 Aug	Scandinavian Airlines
17 Aug - 25 Aug	Turkish Airlines
09 Aug - 12 Aug	Turkish Airlines	direct
25 Aug - 31 Aug	Aegean Airlines
10 Aug - 26 Aug	Scandinavian Airlines
10 Aug - 24 Aug	Air Serbia
07 Aug - 14 Aug	Eurowings
08 Aug - 14 Aug	Scandinavian Airlines

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 179€

Return flights