Are there nonstop flights from Kolkata (CCU) to Shanghai (PVG)?

Yes. IndiGo fly this route. Flight time is about 4h 32m.

What is the fastest connection from Kolkata (CCU) to Shanghai (PVG)?

via Kunming ≈ 5h 5m, via Hanoi ≈ 5h 24m, via Guangzhou ≈ 5h 24m (estimated flying time, excluding layovers).

from 18,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Netaji Subhash Chandra Bose International Airport (CCU) to Shanghai Pudong International Airport (PVG)・3,425 km

Nonstop flights available (1 airline). Flight time about 4h 32m. Nonstop return flights also operate.

With milesANA 18,000 miles+ (via BKK)JAL 23,000 miles+ (via KMG)Economy, one way, estimate. Tap a connection for miles by cabin.

11 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.