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

Return flights

04 Sep - 08 Sep	Icelandair
09 Sep - 15 Sep	Icelandair
22 Sep - 06 Oct	FrenchBee
04 Sep - 11 Sep	Icelandair
09 Sep - 18 Sep	Icelandair
03 Sep - 19 Sep	Air Canada
02 Sep - 11 Sep	FrenchBee
02 Sep - 04 Oct	FrenchBee
01 Sep - 30 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
22 Sep - 25 Sep	FrenchBee
06 Sep - 17 Sep	FrenchBee
21 Sep - 04 Oct	FrenchBee
23 Sep - 07 Oct	Turkish Airlines	direct
01 Sep - 01 Oct	Air Canada
17 Sep - 01 Oct	Turkish Airlines	direct
25 Sep - 01 Oct	FrenchBee
19 Sep - 04 Oct	LOT
25 Sep - 01 Oct	Turkish Airlines	direct
29 Sep - 14 Oct	Turkish Airlines	direct

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 464€

Return flights