AirHint found the following cheapest return flights from Boston (BOS) to Islamabad (ISB) in December 2025 (see full year).
Return flights
| 31 Dec - 20 Jan | Turkish Airlines | ||
| 29 Dec - 15 Jan | Turkish Airlines | ||
| 29 Dec - 25 Jan | Turkish Airlines | ||
| 06 Dec - 12 Dec | KLM | ||
| 14 Dec - 22 Jan | Aer Lingus | ||
| 22 Dec - 19 Jan | Spirit Airlines |
Also check the deals for one-way flights from Boston to Islamabad in December.
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