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

Return flights

01 Dec - 11 Dec	Icelandair
09 Dec - 16 Dec	Lufthansa
03 Dec - 16 Jan	Icelandair
04 Dec - 09 Dec	Icelandair
02 Dec - 16 Dec	LOT
04 Dec - 09 Dec	Turkish Airlines	direct
02 Dec - 16 Dec	Turkish Airlines	direct
09 Dec - 09 Jan	Air France
05 Dec - 19 Dec	Turkish Airlines	direct
12 Dec - 14 Jan	Air Canada
17 Dec - 19 Dec	Air France
26 Dec - 09 Jan	Lufthansa
09 Dec - 16 Dec	Turkish Airlines	direct
03 Dec - 16 Jan	Turkish Airlines	direct
23 Dec - 30 Dec	Lufthansa
23 Dec - 06 Jan	Air France
24 Dec - 01 Jan	Air France
10 Dec - 03 Jan	Air France
09 Dec - 09 Jan	Turkish Airlines	direct
25 Dec - 03 Jan	Air France

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 506€

Return flights