The calculated distance (air line) between Hořovice and Mladá Boleslav is approximately 60 miles respectively 96 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Hořovice and Mladá Boleslav has been calculated here.
Air line (approximately)
96 kilometers
52 nautical miles