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

Return flights

06 May - 13 May	Iberia
02 May - 16 May	Scandinavian Airlines
05 May - 19 May	Scandinavian Airlines
14 May - 17 May	Scandinavian Airlines
10 May - 16 May	KLM
10 May - 15 May	Icelandair
14 May - 02 Jun	Brussels Airlines
01 May - 16 May	KLM
29 May - 06 Jun	KLM
15 May - 17 May	KLM
20 May - 06 Jun	Lufthansa
22 May - 01 Jun	KLM
30 May - 04 Jun	KLM
19 May - 08 Jun	Lufthansa
18 May - 08 Jun	Lufthansa
21 May - 25 May	Scandinavian Airlines
19 May - 09 Jun	Lufthansa
23 May - 30 May	Air France
19 May - 09 Jun	Turkish Airlines	direct
19 May - 08 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.

Book a cheap hotel in Istanbul

Cheap car rent in Istanbul

Cheapest return flights from Boston to Istanbul in May from 465€

Return flights