The calculated distance (air line) between Dayr Ḩāfir and Al Bāb is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Al Bāb is certainly longer, as only the direct route (as the crow flies) between Dayr Ḩāfir and Al Bāb has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles