Are there nonstop flights from Jaipur (JAI) to Guwahati (GAU)?

Yes. IndiGo, Air India Express fly this route. Flight time is about 2h 21m.

What is the fastest connection from Jaipur (JAI) to Guwahati (GAU)?

via New Delhi ≈ 2h 59m, via Kolkata ≈ 3h 11m, via Ahmedabad ≈ 3h 54m (estimated flying time, excluding layovers).

from 15,000 ANA miles (economy, one way, based on the published award charts).

Jaipur International Airport (JAI) to Lokpriya Gopinath Bordoloi International Airport (GAU)・1,571 km

Nonstop flights available (2 airlines). Flight time about 2h 21m. Nonstop return flights also operate.

With milesANA 15,000 miles+ (via DEL)Economy, one way, estimate. Tap a connection for miles by cabin.

8 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

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