Cheapest return BOS–IST flights, May

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

Return flights

25 May - 01 Jun Iberia
22 May - 29 May Lufthansa
23 May - 29 May Lufthansa
29 May - 04 Jun Icelandair
31 May - 22 Jun Icelandair
31 May - 18 Jun Icelandair
30 May - 22 Jun Icelandair
30 May - 17 Jun Icelandair
29 May - 12 Jun Lufthansa
24 May - 07 Jun Icelandair
30 May - 16 Jun Icelandair
30 May - 18 Jun Icelandair
24 May - 31 May Iberia
24 May - 31 May Turkish Airlines direct
23 May - 29 May Turkish Airlines direct
22 May - 29 May Turkish Airlines direct

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

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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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