The calculated distance (air line) between As Saffānīyah and Ar Riqqah is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to Ar Riqqah is certainly longer, as only the direct route (as the crow flies) between As Saffānīyah and Ar Riqqah has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles