The calculated distance (air line) between Dayr al Balaḩ and Bethlehem is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Bethlehem is certainly longer, as only the direct route (as the crow flies) between Dayr al Balaḩ and Bethlehem has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles