The calculated distance (air line) between Bayān and As Saffānīyah is approximately 101 miles respectively 162 kilometers.
By car or train, the actual journey to As Saffānīyah is certainly longer, as only the direct route (as the crow flies) between Bayān and As Saffānīyah has been calculated here.
Air line (approximately)
162 kilometers
88 nautical miles