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