The calculated distance (air line) between Jablunkov and Mladá Boleslav is approximately 181 miles respectively 291 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Jablunkov and Mladá Boleslav has been calculated here.
Air line (approximately)
291 kilometers
157 nautical miles