Are there nonstop flights from London (LHR) to Ho Chi Minh City (SGN)?

Yes. Vietnam Airlines fly this route. Flight time is about 12h 31m.

What is the fastest connection from London (LHR) to Ho Chi Minh City (SGN)?

via Copenhagen ≈ 13h 3m, via Bangkok ≈ 13h 7m, via Frankfurt am Main ≈ 13h 8m (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 Tan Son Nhat International Airport (SGN)・10,219 km

Nonstop flights available (1 airline). Flight time about 12h 31m. Nonstop return flights also operate.

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

36 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.