Are there nonstop flights from Varanasi (VNS) to Bangkok (BKK)?

Yes. Air India Express fly this route. Flight time is about 3h 11m.

What is the fastest connection from Varanasi (VNS) to Bangkok (BKK)?

via Kolkata ≈ 3h 42m, via Bhubaneswar ≈ 3h 49m, via Kathmandu ≈ 4h 2m (estimated flying time, excluding layovers).

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

Lal Bahadur Shastri International Airport (VNS) to Suvarnabhumi Airport (BKK)・2,281 km

Nonstop flights available (1 airline). Flight time about 3h 11m. Nonstop return flights also operate.

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

10 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.