Are there nonstop flights from Sydney (SYD) to Kolkata (CCU)?

No. The fastest connection is via Bangkok, about 11h 46m of total flying time.

What is the fastest connection from Sydney (SYD) to Kolkata (CCU)?

via Bangkok ≈ 11h 46m, via Ho Chi Minh City ≈ 11h 48m, via Phuket ≈ 11h 49m (estimated flying time, excluding layovers).

from 23,000 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

Sydney Kingsford Smith International Airport (SYD) to Netaji Subhash Chandra Bose International Airport (CCU)・9,140 km

No nonstop flights. The fastest connection is via Bangkok (BKK), about 11h 46m of flying time (layover not included).

With milesANA 23,000 miles+ (via BKK)JAL 37,000 miles+ (via KUL)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

13 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.