AirHint found the following cheapest one-way flights from Washington (IAD) to Istanbul (IST) in December 2025 (see full year).
One-Way flights
| 29 Dec | TAP | ||
| 28 Dec | TAP | ||
| 30 Dec | SWISS | ||
| 27 Dec | Air France | ||
| 29 Dec | Turkish Airlines | direct | |
| 30 Dec | Turkish Airlines | direct | |
| 28 Dec | Turkish Airlines | direct | |
| 27 Dec | Turkish Airlines | direct |
Also check the deals for return flights from Washington to Istanbul in December.
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