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

Return flights

22 Sep - 04 Oct	Icelandair
25 Sep - 04 Oct	Icelandair
18 Sep - 04 Oct	Icelandair
06 Sep - 09 Sep	Icelandair
25 Sep - 08 Oct	Icelandair
10 Sep - 23 Sep	KLM
25 Sep - 18 Oct	Icelandair
15 Sep - 20 Sep	Icelandair
06 Sep - 20 Sep	Icelandair
06 Sep - 13 Sep	Icelandair
17 Sep - 24 Sep	KLM
12 Sep - 21 Sep	Air France
25 Sep - 02 Oct	Air France
11 Sep - 21 Sep	Air France
15 Sep - 08 Oct	Icelandair
11 Sep - 02 Oct	Air France
23 Sep - 01 Oct	KLM
10 Sep - 22 Sep	KLM
10 Sep - 21 Sep	KLM
25 Sep - 05 Oct	Wizz Air

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 357€

Return flights