Are there nonstop flights from London (LHR) to Phuket (HKT)?

Yes. Virgin Atlantic fly this route. Flight time is about 12h 9m.

What is the fastest connection from London (LHR) to Phuket (HKT)?

via New Delhi ≈ 12h 39m, via Tashkent ≈ 12h 40m, via Frankfurt am Main ≈ 12h 42m (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 Phuket International Airport (HKT)・9,904 km

Nonstop flights available (1 airline). Flight time about 12h 9m. Nonstop return flights also operate.

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

42 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.