Are there nonstop flights from Boston (BOS) to Xi'an (XIY)?

No. The fastest connection is via Beijing, about 14h 49m of total flying time.

What is the fastest connection from Boston (BOS) to Xi'an (XIY)?

via Beijing ≈ 14h 49m, via Seoul ≈ 15h 49m, via London ≈ 16h 52m (estimated flying time, excluding layovers).

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

Boston Logan International Airport (BOS) to Xi'an Xianyang International Airport (XIY)・11,475 km

No nonstop flights. The fastest connection is via Beijing (PEK), about 14h 49m of flying time (layover not included).

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

None.

10 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.