AirHint found the following cheapest return flights from Boston (BOS) to Kathmandu (KTM) in December 2025 (see full year).
Return flights
| 01 Dec - 16 Dec | Turkish Airlines | ||
| 02 Dec - 16 Dec | SWISS | ||
| 01 Dec - 15 Jan | Turkish Airlines | ||
| 05 Dec - 21 Jan | IndiGo | ||
| 15 Dec - 10 Jan | SWISS | ||
| 25 Dec - 20 Jan | IndiGo | ||
| 14 Dec - 15 Jan | Austrian Airlines |
Also check the deals for one-way flights from Boston to Kathmandu in December.
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