The calculated distance (air line) between Horní Počernice and Mladá Boleslav is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Horní Počernice and Mladá Boleslav has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles