The calculated distance (air line) between Al Faḩāḩīl and As Saffānīyah is approximately 85 miles respectively 137 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 Faḩāḩīl and As Saffānīyah has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles