The calculated distance (air line) between Varnsdorf and Mladá Boleslav is approximately 37 miles respectively 59 kilometers.
By car or train, the actual journey to Mladá Boleslav is certainly longer, as only the direct route (as the crow flies) between Varnsdorf and Mladá Boleslav has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles