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

Return flights

31 Aug - 08 Sep	Air France
24 Aug - 22 Sep	British Airways
27 Aug - 08 Sep	British Airways
24 Aug - 20 Sep	KLM
24 Aug - 23 Sep	KLM
24 Aug - 07 Sep	KLM
24 Aug - 21 Sep	KLM
25 Aug - 08 Sep	KLM
20 Aug - 27 Aug	SWISS
19 Aug - 28 Aug	SWISS
29 Aug - 13 Sep	KLM
07 Aug - 20 Aug	Icelandair
05 Aug - 13 Aug	Austrian Airlines
21 Aug - 28 Aug	SWISS
23 Aug - 27 Aug	Icelandair
24 Aug - 27 Aug	SWISS
22 Aug - 29 Aug	KLM
11 Aug - 25 Aug	British Airways
13 Aug - 23 Aug	British Airways
15 Aug - 01 Sep	Air France

Also check the deals for one-way flights from Boston 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 Boston to Istanbul in August from 487€

Return flights