The calculated distance (air line) between Šternberk and Mladá Boleslav is approximately 116 miles respectively 187 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Šternberk and Mladá Boleslav has been calculated here.
Air line (approximately)
187 kilometers
101 nautical miles