The calculated distance (air line) between Železný Brod and Mladá Boleslav is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Železný Brod and Mladá Boleslav has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles