AirHint found the following cheapest return flights from Chicago (ORD) to Istanbul (IST) in December 2026 (see full year).
Return flights
| 24 Dec - 02 Jan | LOT | ||
| 18 Dec - 01 Jan | Lufthansa | ||
| 25 Dec - 03 Jan | Turkish Airlines | direct | |
| 18 Dec - 01 Jan | Turkish Airlines | direct |
Also check the deals for one-way flights from Chicago to Istanbul in December.
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