Are there nonstop flights from Changsha (CSX) to Vientiane (VTE)?

Yes. West Air, Lao Airlines fly this route. Flight time is about 2h 21m.

What is the fastest connection from Changsha (CSX) to Vientiane (VTE)?

via Hanoi ≈ 2h 51m, via Nanning ≈ 2h 52m, via Guangzhou ≈ 3h 7m (estimated flying time, excluding layovers).

from 15,000 JAL miles, from 18,000 ANA miles (economy, one way, based on the published award charts).

Changsha Huanghua International Airport (CSX) to Wattay International Airport (VTE)・1,571 km

Nonstop flights available (2 airlines). Flight time about 2h 21m. Nonstop return flights also operate.

With milesJAL 15,000 miles+ (via KMG)ANA 18,000 miles+ (via BKK)Economy, one way, estimate. Tap a connection for miles by cabin.

27 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.