The calculated distance (air line) between Ulan Bator and Dzüünharaa is approximately 68 miles respectively 110 kilometers.
By car or train, the actual journey to Dzüünharaa is certainly longer, as only the direct route (as the crow flies) between Ulan Bator and Dzüünharaa has been calculated here.
Air line (approximately)
110 kilometers
59 nautical miles