AirHint found the following cheapest return flights from Chicago (ORD) to Istanbul (SAW) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	Icelandair
01 Sep - 09 Sep	Icelandair
08 Sep - 22 Sep	Air Canada
05 Sep - 12 Sep	Icelandair
12 Sep - 21 Sep	Icelandair
07 Sep - 14 Sep	Icelandair
15 Sep - 26 Sep	Icelandair
05 Sep - 16 Sep	Icelandair
05 Sep - 14 Sep	Icelandair
22 Sep - 06 Oct	Air Canada
01 Sep - 30 Sep	Icelandair
17 Sep - 17 Oct	Icelandair
25 Sep - 01 Oct	Air Canada
11 Sep - 28 Sep	Air Canada
16 Sep - 14 Oct	KLM
24 Sep - 25 Oct	Icelandair
25 Sep - 25 Oct	Icelandair
14 Sep - 15 Oct	Icelandair
17 Sep - 15 Oct	Icelandair
29 Sep - 09 Oct	Air Canada

Also check the deals for one-way flights from Chicago 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 Chicago to Istanbul in September from $650

Return flights