AirHint found the following cheapest return flights from Boston (BOS) to Istanbul (IST) in May 2026 (see full year).

Return flights

31 May - 30 Jun	Air France
13 May - 26 May	KLM
19 May - 10 Jun	Air France
16 May - 09 Jun	KLM
16 May - 09 Jun	Turkish Airlines	direct
13 May - 26 May	Turkish Airlines	direct
19 May - 10 Jun	Turkish Airlines	direct
31 May - 30 Jun	Turkish Airlines	direct

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

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 May from 623€

Return flights