Are there nonstop flights from Hat Yai (HDY) to Chiang Mai (CNX)?

Yes. Thai AirAsia fly this route. Flight time is about 2h 4m.

What is the fastest connection from Hat Yai (HDY) to Chiang Mai (CNX)?

via Hua Hin ≈ 2h 34m, via Bangkok ≈ 2h 35m, via Bangkok ≈ 2h 35m (estimated flying time, excluding layovers).

from 12,000 JAL miles, from 15,000 ANA miles (economy, one way, based on the published award charts).

Hat Yai International Airport (HDY) to Chiang Mai International Airport (CNX)・1,325 km

Nonstop flights available (1 airline). Flight time about 2h 4m. Nonstop return flights also operate.

With milesJAL 12,000 miles+ (via HKT)ANA 15,000 miles+ (via BKK)Economy, one way, estimate. Tap a connection for miles by cabin.

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.