Are there nonstop flights from Kathmandu (KTM) to Varanasi (VNS)?

Yes. Buddha Air fly this route. Flight time is about 55m.

Kathmandu → Varanasi

Tribhuvan International Airport (KTM) to Lal Bahadur Shastri International Airport (VNS)・352 km

Nonstop flights available (1 airline). 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.