The calculated distance (air line) between Ar Riyāḑ and Madīnat an Naşr is approximately 84 miles respectively 135 kilometers.
By car or train, the actual journey to Madīnat an Naşr is certainly longer, as only the direct route (as the crow flies) between Ar Riyāḑ and Madīnat an Naşr has been calculated here.
Air line (approximately)
135 kilometers
73 nautical miles