AirHint found the following cheapest return flights from Istanbul (IST) to Newark (EWR) in September 2025 (see full year).

Return flights

25 Sep - 01 Oct	Icelandair
26 Sep - 06 Oct	Pegasus Airlines
08 Sep - 01 Oct	Icelandair
17 Sep - 24 Sep	KLM
17 Sep - 17 Oct	Pegasus Airlines
25 Sep - 04 Oct	Icelandair
08 Sep - 04 Oct	Icelandair
18 Sep - 04 Oct	Icelandair
22 Sep - 18 Oct	Air France
18 Sep - 26 Sep	Pegasus Airlines
20 Sep - 25 Sep	Pegasus Airlines
15 Sep - 20 Sep	Icelandair
12 Sep - 14 Sep	Pegasus Airlines
18 Sep - 22 Sep	Pegasus Airlines
08 Sep - 26 Sep	KLM
15 Sep - 29 Sep	Pegasus Airlines
17 Sep - 21 Sep	Pegasus Airlines
11 Sep - 15 Sep	Pegasus Airlines
24 Sep - 02 Oct	Pegasus Airlines
08 Sep - 03 Oct	KLM

Also check the deals for one-way flights from Istanbul to Newark in September.

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 Istanbul to Newark in September from $481

Return flights