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

Return flights

20 Aug - 27 Aug	Icelandair
20 Aug - 26 Aug	Icelandair
11 Aug - 24 Aug	Icelandair
21 Aug - 28 Aug	Icelandair
24 Aug - 30 Aug	Icelandair
11 Aug - 21 Aug	Icelandair
16 Aug - 23 Aug	TAP
17 Aug - 26 Aug	Icelandair
28 Aug - 16 Sep	Icelandair
22 Aug - 06 Sep	Icelandair
11 Aug - 18 Aug	Icelandair
17 Aug - 25 Aug	Icelandair
30 Aug - 07 Sep	Icelandair
21 Aug - 04 Sep	Spirit Airlines
26 Aug - 01 Sep	Icelandair
06 Aug - 01 Sep	Spirit Airlines
01 Aug - 01 Sep	Spirit Airlines
06 Aug - 01 Sep	Turkish Airlines	direct
21 Aug - 04 Sep	Turkish Airlines	direct
28 Aug - 16 Sep	Turkish Airlines	direct

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

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 August from 545€

Return flights