Are there nonstop flights from Sanya (SYX) to Xining (XNN)?

Yes. Sichuan Airlines fly this route. Flight time is about 3h 2m.

What is the fastest connection from Sanya (SYX) to Xining (XNN)?

via Luzhou ≈ 3h 32m, via Nanning ≈ 3h 32m, via Guiyang ≈ 3h 32m (estimated flying time, excluding layovers).

from 10,000 ANA miles, from 15,000 JAL miles (economy, one way, based on the published award charts).

Sanya Phoenix International Airport (SYX) to Xining Caojiabao International Airport (XNN)・2,151 km

Nonstop flights available (1 airline). Flight time about 3h 2m. Nonstop return flights also operate.

With milesANA 10,000 miles+ (via TFU)JAL 15,000 miles+ (via KMG)Economy, one way, estimate. Tap a connection for miles by cabin.

38 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.