The calculated distance (air line) between Ústí nad Labem and Mladá Boleslav is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Ústí nad Labem and Mladá Boleslav has been calculated here.
Air line (approximately)
68 kilometers
36 nautical miles