Are there nonstop flights from London (LHR) to Hanoi (HAN)?

Yes. Vietnam Airlines fly this route. Flight time is about 11h 22m.

What is the fastest connection from London (LHR) to Hanoi (HAN)?

via Amsterdam ≈ 11h 52m, via Almaty ≈ 11h 53m, via Prague ≈ 12h 1m (estimated flying time, excluding layovers).

from 29,500 ANA miles, from 40,000 JAL miles (economy, one way, based on the published award charts).

London Heathrow Airport (LHR) to Noi Bai International Airport (HAN)・9,238 km

Nonstop flights available (1 airline). Flight time about 11h 22m. Nonstop return flights also operate.

With milesANA 29,500 miles+ (via DEL)JAL 40,000 miles+ (via HKG)Economy, one way, estimate. Tap a connection for miles by cabin.

39 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.