The calculated distance (air line) between Jannātah and Dayr al Balaḩ is approximately 54 miles respectively 87 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 Jannātah and Dayr al Balaḩ has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles