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