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

Return flights

07 Apr - 21 Apr	Delta
06 Apr - 22 Apr	Delta
05 Apr - 21 Apr	Delta
06 Apr - 21 Apr	Delta
14 Apr - 21 Apr	Delta
12 Apr - 23 Apr	Delta
05 Apr - 05 May	Lufthansa
21 Apr - 05 May	Lufthansa
05 Apr - 04 May	KLM
19 Apr - 27 Apr	Lufthansa
04 Apr - 21 Apr	Delta
05 Apr - 02 May	Delta
05 Apr - 03 May	Delta
21 Apr - 02 May	Delta
22 Apr - 02 May	Delta
03 Apr - 21 Apr	Lufthansa
09 Apr - 05 May	Lufthansa
24 Apr - 03 May	Delta
18 Apr - 02 May	Lufthansa
06 Apr - 21 Apr	Turkish Airlines	direct

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

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 April from 448€

Return flights