The calculated distance (air line) between Al Manqaf and As Saffānīyah is approximately 86 miles respectively 138 kilometers.
By car or train, the actual journey to As Saffānīyah is certainly longer, as only the direct route (as the crow flies) between Al Manqaf and As Saffānīyah has been calculated here.
Air line (approximately)
138 kilometers
74 nautical miles