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

No. The fastest connection is via Paris, about 11h 3m of total flying time.

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

via Paris ≈ 11h 3m, via Vienna ≈ 11h 9m, via Budapest ≈ 11h 14m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

London Gatwick Airport (LGW) to Xi'an Xianyang International Airport (XIY)・8,249 km

No nonstop flights. The fastest connection is via Paris (CDG), about 11h 3m of flying time (layover not included).

With milesANA 30,000 miles+ (via PEK)JAL 45,000 miles+ (via PVG)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

17 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.