The calculated distance (air line) between Jaroměř and Mladá Boleslav is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Jaroměř and Mladá Boleslav has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles