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

Return flights

08 Dec - 11 Dec	Spirit Airlines
10 Dec - 09 Jan	Frontier Airlines
08 Dec - 13 Dec	Icelandair
12 Dec - 26 Dec	Spirit Airlines
24 Dec - 12 Jan	Icelandair
24 Dec - 23 Jan	Icelandair
30 Dec - 13 Jan	Air France
27 Dec - 10 Jan	Air France
24 Dec - 08 Jan	Air Serbia
28 Dec - 06 Jan	Air France
29 Dec - 15 Jan	SWISS
15 Dec - 15 Jan	Air France
14 Dec - 24 Dec	Air France
17 Dec - 23 Dec	Air Serbia
17 Dec - 10 Jan	Spirit Airlines
15 Dec - 29 Dec	Air France
17 Dec - 27 Dec	Air Serbia
24 Dec - 31 Dec	Air France
12 Dec - 26 Dec	Turkish Airlines	direct
23 Dec - 31 Dec	Icelandair

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 486€

Return flights