Are there nonstop flights from Kabul (KBL) to Islamabad (ISB)?

Yes. Kam Air, Ariana Afghan Airlines fly this route. Flight time is about 55m.

Kabul → Islamabad

Kabul International Airport (KBL) to Islamabad International Airport (ISB)・352 km

Nonstop flights available (2 airlines). Flight time about 55m. Nonstop return flights also operate.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.