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

Return flights

24 Aug - 30 Sep	Icelandair
18 Aug - 23 Sep	Icelandair
12 Aug - 19 Aug	Brussels Airlines
31 Aug - 25 Sep	Icelandair
19 Aug - 09 Sep	Air Canada
12 Aug - 12 Sep	Air Europa
11 Aug - 01 Sep	Air Canada
20 Aug - 27 Aug	Icelandair
13 Aug - 27 Aug	Air France
25 Aug - 01 Sep	Air France
23 Aug - 03 Sep	Icelandair
11 Aug - 20 Aug	Air Canada
05 Aug - 27 Aug	Air France
13 Aug - 20 Aug	Air Canada
05 Aug - 26 Aug	Air France
11 Aug - 18 Aug	TAP
25 Aug - 06 Sep	Air France
05 Aug - 12 Aug	TAP
06 Aug - 13 Aug	British Airways
19 Aug - 08 Sep	British Airways

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 $503

Return flights