The calculated distance (air line) between Al Kittah and Wādī as Sīr is approximately 22 miles respectively 36 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 Al Kittah and Wādī as Sīr has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles