Are there nonstop flights from Nanning (NNG) to Changsha (CSX)?

Yes. China Southern Airlines, GX Airlines fly this route. Flight time is about 1h 27m.

What is the fastest connection from Nanning (NNG) to Changsha (CSX)?

via Guangzhou ≈ 2h 15m, via Shenzhen ≈ 2h 25m, via Macau ≈ 2h 27m (estimated flying time, excluding layovers).

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

Nanning Wuxu International Airport (NNG) to Changsha Huanghua International Airport (CSX)・801 km

Nonstop flights available (2 airlines). Flight time about 1h 27m. Nonstop return flights also operate.

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

20 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.