The calculated distance (air line) between Arīsh and Dayr al Balaḩ is approximately 38 miles respectively 61 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 Arīsh and Dayr al Balaḩ has been calculated here.
Air line (approximately)
61 kilometers
33 nautical miles