Are there nonstop flights from Xi'an (XIY) to London (LHR)?

Yes. Tianjin Airlines fly this route. Flight time is about 10h 12m.

What is the fastest connection from Xi'an (XIY) to London (LHR)?

via Almaty ≈ 11h 1m, via Paris ≈ 11h 6m, via Vienna ≈ 11h 11m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 40,000 JAL miles (economy, one way, based on the published award charts).

Xi'an Xianyang International Airport (XIY) to London Heathrow Airport (LHR)・8,244 km

Nonstop flights available (1 airline). Flight time about 10h 12m. Nonstop return flights also operate.

With milesANA 30,000 miles+ (via PEK)JAL 40,000 miles+ (via HKG)Economy, one way, estimate. Tap a connection for miles by cabin.

31 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.