The calculated distance (air line) between Malkā and Wādī as Sīr is approximately 50 miles respectively 81 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 Malkā and Wādī as Sīr has been calculated here.
Air line (approximately)
81 kilometers
43 nautical miles