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

Return flights

23 Sep - 07 Oct	TAP
15 Sep - 22 Sep	TAP
03 Sep - 09 Sep	TAP
04 Sep - 18 Sep	Icelandair
06 Sep - 15 Sep	Icelandair
13 Sep - 18 Sep	Icelandair
08 Sep - 15 Sep	Air Canada
16 Sep - 22 Sep	TAP
11 Sep - 19 Sep	TAP
01 Sep - 01 Oct	SWISS
01 Sep - 04 Sep	Icelandair
03 Sep - 26 Sep	Air Canada
28 Sep - 14 Oct	TAP
30 Sep - 11 Oct	Icelandair
27 Sep - 04 Oct	TAP
04 Sep - 10 Oct	Icelandair
27 Sep - 07 Oct	Spirit Airlines
25 Sep - 02 Oct	TAP
16 Sep - 15 Oct	TAP
30 Sep - 15 Oct	Icelandair

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 $481

Return flights