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

Return flights

22 Jul - 28 Jul	SWISS
29 Jul - 27 Aug	Iberia
08 Jul - 15 Jul	SWISS
17 Jul - 30 Jul	Turkish Airlines	direct
09 Jul - 16 Jul	SWISS
27 Jul - 05 Aug	Air Canada
14 Jul - 19 Jul	Etihad Airways
21 Jul - 28 Aug	Air France
15 Jul - 21 Jul	SWISS
17 Jul - 28 Aug	Air France
18 Jul - 28 Aug	Air France
29 Jul - 05 Aug	Air France
29 Jul - 06 Aug	Air France
28 Jul - 05 Aug	Air France
28 Jul - 06 Aug	Air France
21 Jul - 25 Jul	Air France
26 Jul - 04 Aug	SWISS
18 Jul - 22 Jul	Air France
18 Jul - 20 Jul	Air France
18 Jul - 21 Jul	Air France

Also check the deals for one-way flights from Boston to Istanbul in July.

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 July from 581€

Return flights