The calculated distance (air line) between Şabḩā and Wādī as Sīr is approximately 48 miles respectively 77 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 Şabḩā and Wādī as Sīr has been calculated here.
Air line (approximately)
77 kilometers
41 nautical miles