Are there nonstop flights from Xiuzhou (JNH) to Changsha (CSX)?

Yes. China Southern Airlines fly this route. Flight time is about 1h 25m.

What is the fastest connection from Xiuzhou (JNH) to Changsha (CSX)?

via Guangzhou ≈ 2h 55m, via Shenzhen ≈ 3h 3m, via Xi'an ≈ 3h 21m (estimated flying time, excluding layovers).

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

Jiaxing Nanhu Airport (JNH) to Changsha Huanghua International Airport (CSX)・773 km

Nonstop flights available (1 airline). Flight time about 1h 25m. Nonstop return flights also operate.

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

4 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.