Are there nonstop flights from Tokyo (HND) to Ulaanbaatar (UBN)?

No. The fastest connection is via Seoul, about 4h 43m of total flying time.

What is the fastest connection from Tokyo (HND) to Ulaanbaatar (UBN)?

via Seoul ≈ 4h 43m, via Dalian ≈ 4h 45m, via Osaka ≈ 4h 46m (estimated flying time, excluding layovers).

from 15,000 JAL miles, from 19,000 ANA miles (economy, one way, based on the published award charts).

Tokyo Haneda International Airport (HND) to Ulaanbaatar Chinggis Khaan International Airport (UBN)・3,023 km

No nonstop flights. The fastest connection is via Seoul (ICN), about 4h 43m of flying time (layover not included).

With milesJAL 15,000 miles+ (via ICN)ANA 19,000 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.