Are there nonstop flights from Siem Reap (SAI) to Da Nang (DAD)?

Yes. Air Cambodia fly this route. Flight time is about 1h 7m.

What is the fastest connection from Siem Reap (SAI) to Da Nang (DAD)?

via Phnom Penh ≈ 2h 1m, via Ho Chi Minh City ≈ 2h 10m, via Phu Quoc Island ≈ 2h 21m (estimated flying time, excluding layovers).

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

Siem Reap-Angkor International Airport (SAI) to Da Nang International Airport (DAD)・521 km

Nonstop flights available (1 airline). Flight time about 1h 7m. Nonstop return flights also operate.

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

6 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.