Are there nonstop flights from Kolkata (CCU) to Allahabad (IXD)?

No. The fastest connection is via Bilaspur, about 2h 13m of total flying time.

What is the fastest connection from Kolkata (CCU) to Allahabad (IXD)?

via Bilaspur ≈ 2h 13m, via Bhubaneswar ≈ 2h 17m, via Raipur ≈ 2h 23m (estimated flying time, excluding layovers).

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

Netaji Subhash Chandra Bose International Airport (CCU) to Prayagraj Airport (IXD)・749 km

No nonstop flights. The fastest connection is via Bilaspur (PAB), about 2h 13m of flying time (layover not included).

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

None.

5 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.