The calculated distance (air line) between Ad Darbāsīyah and Al Bāb is approximately 180 miles respectively 290 kilometers.
By car or train, the actual journey to Al Bāb is certainly longer, as only the direct route (as the crow flies) between Ad Darbāsīyah and Al Bāb has been calculated here.
Air line (approximately)
290 kilometers
157 nautical miles