The calculated distance (air line) between Sūf and Wādī as Sīr is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Wādī as Sīr is certainly longer, as only the direct route (as the crow flies) between Sūf and Wādī as Sīr has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles