Are there nonstop flights from Changsha (CSX) to Jiayuguan (JGN)?

Yes. Xiamen Airlines, 9 Air fly this route. Flight time is about 2h 43m.

What is the fastest connection from Changsha (CSX) to Jiayuguan (JGN)?

via Lanzhou ≈ 3h 13m, via Xi'an ≈ 3h 15m, via Yinchuan ≈ 3h 21m (estimated flying time, excluding layovers).

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

Changsha Huanghua International Airport (CSX) to Jiayuguan International Airport (JGN)・1,883 km

Nonstop flights available (2 airlines). Flight time about 2h 43m. Nonstop return flights also operate.

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

14 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.