Are there nonstop flights from Bangkok (BKK) to Ulaanbaatar (UBN)?

No. The fastest connection is via Sanya, about 6h 6m of total flying time.

What is the fastest connection from Bangkok (BKK) to Ulaanbaatar (UBN)?

via Sanya ≈ 6h 6m, via Beijing ≈ 6h 14m, via Guangzhou ≈ 6h 15m (estimated flying time, excluding layovers).

from 15,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Suvarnabhumi Airport (BKK) to Ulaanbaatar Chinggis Khaan International Airport (UBN)・3,819 km

No nonstop flights. The fastest connection is via Sanya (SYX), about 6h 6m of flying time (layover not included).

With milesANA 15,000 miles+ (via PEK)JAL 23,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

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Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.