The calculated distance (air line) between Rafaḩ and Dayr al Balaḩ is approximately 10 miles respectively 17 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 Rafaḩ and Dayr al Balaḩ has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles