Are there nonstop flights from Altai (LTI) to Ulaanbaatar (UBN)?

Yes. MIAT Mongolian Airlines fly this route. Flight time is about 1h 28m.

Altai → Ulaanbaatar

Altai Airport (LTI) to Ulaanbaatar Chinggis Khaan International Airport (UBN)・815 km

Nonstop flights available (1 airline). Flight time about 1h 28m. Nonstop return flights also operate.

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