The calculated distance (air line) between Naḩḩālīn and Dayr al Balaḩ is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Dayr al Balaḩ is certainly longer, as only the direct route (as the crow flies) between Naḩḩālīn and Dayr al Balaḩ has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles