The calculated distance (air line) between Ar Rumaythah and Sūsangerd is approximately 176 miles respectively 283 kilometers.
By car or train, the actual journey to Sūsangerd is certainly longer, as only the direct route (as the crow flies) between Ar Rumaythah and Sūsangerd has been calculated here.
Air line (approximately)
283 kilometers
153 nautical miles