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

Return flights

18 Aug - 26 Aug	British Airways
31 Aug - 25 Sep	Air France
25 Aug - 09 Sep	Air France
25 Aug - 08 Sep	Air France
31 Aug - 24 Sep	Air France
17 Aug - 23 Aug	British Airways
04 Aug - 03 Sep	Air France
12 Aug - 02 Sep	Air France
20 Aug - 27 Aug	SWISS
25 Aug - 01 Sep	Air France
05 Aug - 27 Aug	Austrian Airlines
04 Aug - 04 Sep	Air France
12 Aug - 19 Aug	Air France
22 Aug - 05 Sep	KLM
22 Aug - 12 Sep	KLM
21 Aug - 28 Aug	SWISS
18 Aug - 28 Aug	Air France
03 Aug - 17 Aug	British Airways
05 Aug - 12 Aug	Air France
04 Aug - 11 Aug	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 459€

Return flights