Cheapest return flights from Chicago to Istanbul in September from 558€

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

Return flights

28 Sep - 08 Oct Spirit Airlines
24 Sep - 22 Oct Frontier Airlines
27 Sep - 04 Oct Spirit Airlines
26 Sep - 29 Sep Spirit Airlines
28 Sep - 04 Oct Spirit Airlines
26 Sep - 04 Oct Spirit Airlines
21 Sep - 30 Sep Frontier Airlines
21 Sep - 11 Oct Frontier Airlines
22 Sep - 24 Sep Scandinavian Airlines
27 Sep - 18 Oct Air Serbia
20 Sep - 30 Sep Frontier Airlines
25 Sep - 02 Oct Frontier Airlines
22 Sep - 29 Sep Frontier Airlines
26 Sep - 18 Oct Frontier Airlines
21 Sep - 12 Oct Frontier Airlines
21 Sep - 29 Sep Frontier Airlines
19 Sep - 26 Sep Frontier Airlines
21 Sep - 27 Sep Frontier Airlines
21 Sep - 28 Sep Frontier Airlines
22 Sep - 28 Sep Frontier Airlines

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

Skyscanner

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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