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

Return flights

06 Dec - 15 Dec	Icelandair
03 Dec - 12 Dec	Icelandair
01 Dec - 07 Dec	Icelandair
06 Dec - 13 Dec	Delta
02 Dec - 16 Dec	Delta
09 Dec - 16 Dec	Delta
29 Dec - 14 Jan	Delta
13 Dec - 11 Jan	Delta
30 Dec - 13 Jan	Delta
29 Dec - 15 Jan	Delta
04 Dec - 11 Dec	Icelandair
05 Dec - 22 Dec	Austrian Airlines
05 Dec - 11 Dec	Icelandair
09 Dec - 15 Dec	British Airways
11 Dec - 10 Jan	Spirit Airlines
11 Dec - 11 Jan	Spirit Airlines
10 Dec - 11 Jan	Spirit Airlines
27 Dec - 16 Jan	Icelandair
12 Dec - 11 Jan	Spirit Airlines
13 Dec - 12 Jan	Delta

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

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 December from $394

Return flights