Are there nonstop flights from Surkhet (SKH) to Kathmandu (KTM)?

Yes. Buddha Air, Guna Airlines fly this route. Flight time is about 57m.

Surkhet → Kathmandu

Surkhet Airport (SKH) to Tribhuvan International Airport (KTM)・378 km

Nonstop flights available (2 airlines). Flight time about 57m. Nonstop return flights also operate.

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