The calculated distance (air line) between Brandýs nad Labem-Stará Boleslav and Kladno is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Kladno is certainly longer, as only the direct route (as the crow flies) between Brandýs nad Labem-Stará Boleslav and Kladno has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles