Are there nonstop flights from Hiroshima (HIJ) to Hanoi (HAN)?

Yes. VietJet Air fly this route. Flight time is about 4h 4m.

What is the fastest connection from Hiroshima (HIJ) to Hanoi (HAN)?

via Shanghai ≈ 4h 35m, via Hong Kong ≈ 4h 42m, via Taipei ≈ 4h 43m (estimated flying time, excluding layovers).

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

Hiroshima Airport (HIJ) to Noi Bai International Airport (HAN)・3,030 km

Nonstop flights available (1 airline). Flight time about 4h 4m. Nonstop return flights also operate.

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

6 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.