Are there nonstop flights from Rome (FCO) to Nha Trang (CXR)?

No. The fastest connection is via Tashkent, about 12h 26m of total flying time.

What is the fastest connection from Rome (FCO) to Nha Trang (CXR)?

via Tashkent ≈ 12h 26m, via Chengdu ≈ 12h 52m, via Chongqing ≈ 12h 58m (estimated flying time, excluding layovers).

from 29,500 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Rome–Fiumicino Leonardo da Vinci International Airport (FCO) to Cam Ranh International Airport / Cam Ranh Air Base (CXR)・9,688 km

No nonstop flights. The fastest connection is via Tashkent (TAS), about 12h 26m of flying time (layover not included).

With milesANA 29,500 miles+ (via ICN)JAL 45,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

10 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.