Are there nonstop flights from Kolkata (CCU) to Istanbul (IST)?

No. The fastest connection is via New Delhi, about 7h 55m of total flying time.

What is the fastest connection from Kolkata (CCU) to Istanbul (IST)?

via New Delhi ≈ 7h 55m, via Kathmandu ≈ 8h, via Dhaka ≈ 8h 18m (estimated flying time, excluding layovers).

from 23,000 JAL miles, from 29,500 ANA miles (economy, one way, based on the published award charts).

Netaji Subhash Chandra Bose International Airport (CCU) to İstanbul Airport (IST)・5,877 km

No nonstop flights. The fastest connection is via New Delhi (DEL), about 7h 55m of flying time (layover not included).

With milesJAL 23,000 miles+ (via DXB)ANA 29,500 miles+ (via DEL)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

15 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.