AirHint found the following cheapest return flights from Islamabad (ISB) to Kathmandu (KTM) in December 2025 (see full year).
Return flights
| 16 Dec - 31 Dec | flydubai | ||
| 18 Dec - 30 Dec | flydubai | ||
| 16 Dec - 23 Dec | flydubai | ||
| 16 Dec - 28 Dec | flydubai | ||
| 17 Dec - 21 Dec | PIA |
Also check the deals for one-way flights from Islamabad to Kathmandu in December.
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