Cheapest return flights from Boston to Kathmandu in December from $939

AirHint found the following cheapest return flights from Boston (BOS) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

08 Dec - 21 Jan SWISS
08 Dec - 20 Jan Lufthansa
01 Dec - 15 Jan Etihad Airways
10 Dec - 21 Jan Aer Lingus
25 Dec - 20 Jan SWISS
26 Dec - 26 Jan IndiGo
11 Dec - 21 Jan TAP
14 Dec - 15 Jan TAP
13 Dec - 14 Jan TAP
14 Dec - 28 Jan ITA Airways

Also check the deals for one-way flights from Boston to Kathmandu in December.

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