The calculated distance (air line) between Bayt Ūlā and Dayr al Balaḩ is approximately 42 miles respectively 67 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 Bayt Ūlā and Dayr al Balaḩ has been calculated here.
Air line (approximately)
67 kilometers
36 nautical miles