The calculated distance (air line) between Dayr Abū Ḑa‘īf and Bethlehem is approximately 53 miles respectively 85 kilometers.
By car or train, the actual journey to Bethlehem is certainly longer, as only the direct route (as the crow flies) between Dayr Abū Ḑa‘īf and Bethlehem has been calculated here.
Air line (approximately)
85 kilometers
46 nautical miles