Are there nonstop flights from Kolkata (CCU) to San Francisco (SFO)?

No. The fastest connection is via Shanghai, about 16h 39m of total flying time.

What is the fastest connection from Kolkata (CCU) to San Francisco (SFO)?

via Shanghai ≈ 16h 39m, via Guangzhou ≈ 17h 1m, via New Delhi ≈ 17h 7m (estimated flying time, excluding layovers).

from 40,000 ANA miles, from 50,000 JAL miles (economy, one way, based on the published award charts).

Netaji Subhash Chandra Bose International Airport (CCU) to San Francisco International Airport (SFO)・12,578 km

No nonstop flights. The fastest connection is via Shanghai (PVG), about 16h 39m of flying time (layover not included).

With milesANA 40,000 miles+ (via DEL)JAL 50,000 miles+ (via DXB)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

7 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.