The calculated distance (air line) between Dayr Abū Ḑa‘īf and Old City is approximately 48 miles respectively 76 kilometers.
By car or train, the actual journey to Old City is certainly longer, as only the direct route (as the crow flies) between Dayr Abū Ḑa‘īf and Old City has been calculated here.
Air line (approximately)
76 kilometers
41 nautical miles