Are there nonstop flights from Changsha (CSX) to Nagoya (NGO)?

Yes. China Southern Airlines fly this route. Flight time is about 3h 16m.

What is the fastest connection from Changsha (CSX) to Nagoya (NGO)?

via Shanghai ≈ 3h 46m, via Seoul ≈ 4h 2m, via Qingdao ≈ 4h 6m (estimated flying time, excluding layovers).

from 11,500 ANA miles, from 15,000 JAL miles (economy, one way, based on the published award charts).

Changsha Huanghua International Airport (CSX) to Chubu Centrair International Airport (NGO)・2,349 km

Nonstop flights available (1 airline). Flight time about 3h 16m. Nonstop return flights also operate.

With milesANA 11,500 miles+ (via ICN)JAL 15,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

13 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.