Are there nonstop flights from Hat Yai (HDY) to Kolkata (CCU)?

No. The fastest connection is via Phuket, about 3h 35m of total flying time.

What is the fastest connection from Hat Yai (HDY) to Kolkata (CCU)?

via Phuket ≈ 3h 35m, via Bangkok ≈ 3h 49m, via Bangkok ≈ 3h 49m (estimated flying time, excluding layovers).

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

Hat Yai International Airport (HDY) to Netaji Subhash Chandra Bose International Airport (CCU)・2,166 km

No nonstop flights. The fastest connection is via Phuket (HKT), about 3h 35m of flying time (layover not included).

With milesANA 15,000 miles+ (via BKK)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.