Are there nonstop flights from Taipei (TPE) to Ulaanbaatar (UBN)?

No. The fastest connection is via Beijing, about 4h 23m of total flying time.

What is the fastest connection from Taipei (TPE) to Ulaanbaatar (UBN)?

via Beijing ≈ 4h 23m, via Tianjin ≈ 4h 23m, via Shanghai ≈ 4h 26m (estimated flying time, excluding layovers).

from 18,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Taiwan Taoyuan International Airport (TPE) to Ulaanbaatar Chinggis Khaan International Airport (UBN)・2,811 km

No nonstop flights. The fastest connection is via Beijing (PEK), about 4h 23m of flying time (layover not included).

With milesANA 18,000 miles+ (via PEK)JAL 23,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

14 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.