The calculated distance (air line) between Efrata and Dayr al Balaḩ is approximately 50 miles respectively 80 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 Efrata and Dayr al Balaḩ has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles