AirHint found the following cheapest one-way flights from Washington (IAD) to Islamabad (ISB) in December 2025 (see full year).
One-Way flights
| 31 Dec | Turkish Airlines | ||
| 09 Dec | EgyptAir | ||
| 11 Dec | EgyptAir | ||
| 02 Dec | Turkish Airlines | ||
| 06 Dec | TAP | ||
| 03 Dec | Turkish Airlines | ||
| 08 Dec | SWISS | ||
| 25 Dec | Frontier Airlines | ||
| 16 Dec | Aer Lingus | ||
| 21 Dec | Frontier Airlines |
Also check the deals for return flights from Washington to Islamabad in December.
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