Are there nonstop flights from Hangzhou (HGH) to Siem Reap (SAI)?

No. The fastest connection is via Shenzhen, about 3h 58m of total flying time.

What is the fastest connection from Hangzhou (HGH) to Siem Reap (SAI)?

via Shenzhen ≈ 3h 58m, via Hanoi ≈ 4h 8m, via Ho Chi Minh City ≈ 4h 30m (estimated flying time, excluding layovers).

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

Hangzhou Xiaoshan International Airport (HGH) to Siem Reap-Angkor International Airport (SAI)・2,507 km

No nonstop flights. The fastest connection is via Shenzhen (SZX), about 3h 58m of flying time (layover not included).

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

None.

9 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.