Are there nonstop flights from Busan (PUS) to Kolkata (CCU)?

No. The fastest connection is via Shanghai, about 5h 59m of total flying time.

What is the fastest connection from Busan (PUS) to Kolkata (CCU)?

via Shanghai ≈ 5h 59m, via Hanoi ≈ 6h 20m, via Bangkok ≈ 7h 17m (estimated flying time, excluding layovers).

from 18,500 ANA miles (economy, one way, based on the published award charts).

Gimhae International Airport (PUS) to Netaji Subhash Chandra Bose International Airport (CCU)・4,147 km

No nonstop flights. The fastest connection is via Shanghai (PVG), about 5h 59m of flying time (layover not included).

With milesANA 18,500 miles+ (via SIN)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.