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