The calculated distance (air line) between Brandýs nad Labem-Stará Boleslav and Prague is approximately 13 miles respectively 20 kilometers.
By car or train, the actual journey to Prague is certainly longer, as only the direct route (as the crow flies) between Brandýs nad Labem-Stará Boleslav and Prague has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles