Are there nonstop flights from Beijing (PKX) to Siem Reap (SAI)?

No. The fastest connection is via Hanoi, about 4h 43m of total flying time.

What is the fastest connection from Beijing (PKX) to Siem Reap (SAI)?

via Hanoi ≈ 4h 43m, via Shenzhen ≈ 4h 55m, via Kunming ≈ 4h 57m (estimated flying time, excluding layovers).

from 18,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Beijing Daxing International Airport (PKX) to Siem Reap-Angkor International Airport (SAI)・3,142 km

No nonstop flights. The fastest connection is via Hanoi (HAN), about 4h 43m of flying time (layover not included).

With milesANA 18,000 miles+ (via BKK)JAL 23,000 miles+ (via KMG)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

10 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.