The calculated distance (air line) between Riyāḑ al Khabrā’ and Unaizah is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Unaizah is certainly longer, as only the direct route (as the crow flies) between Riyāḑ al Khabrā’ and Unaizah has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles