Are there nonstop flights from Shenzhen (SZX) to Siem Reap (SAI)?

Yes. Air Cambodia fly this route. Flight time is about 2h 12m.

What is the fastest connection from Shenzhen (SZX) to Siem Reap (SAI)?

via Hanoi ≈ 3h 2m, via Phnom Penh ≈ 3h 8m, via Ho Chi Minh City ≈ 3h 14m (estimated flying time, excluding layovers).

from 15,000 JAL miles, from 18,000 ANA miles (economy, one way, based on the published award charts).

Shenzhen Bao'an International Airport (SZX) to Siem Reap-Angkor International Airport (SAI)・1,444 km

Nonstop flights available (1 airline). Flight time about 2h 12m. Nonstop return flights also operate.

With milesJAL 15,000 miles+ (via KMG)ANA 18,000 miles+ (via BKK)Economy, one way, estimate. Tap a connection for miles by cabin.

8 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.