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

Return flights

15 Sep - 19 Sep	Icelandair
22 Sep - 26 Sep	Icelandair
21 Sep - 03 Oct	Scandinavian Airlines
30 Sep - 15 Oct	Icelandair
16 Sep - 21 Sep	Scandinavian Airlines
24 Sep - 14 Oct	Air Canada
28 Sep - 20 Oct	Icelandair
29 Sep - 15 Oct	Icelandair
21 Sep - 24 Sep	Air Canada
27 Sep - 14 Oct	FrenchBee
22 Sep - 07 Oct	Austrian Airlines
22 Sep - 30 Sep	Icelandair
30 Sep - 07 Oct	SWISS
18 Sep - 21 Sep	Scandinavian Airlines
14 Sep - 04 Oct	Scandinavian Airlines
09 Sep - 04 Oct	FrenchBee
23 Sep - 29 Sep	Icelandair
23 Sep - 30 Sep	Icelandair
16 Sep - 25 Sep	Icelandair
11 Sep - 18 Sep	Air Canada

Also check the deals for one-way flights from Newark to Istanbul 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 Newark to Istanbul in September from $545

Return flights