The calculated distance (air line) between Al Khinzīrah and Wādī as Sīr is approximately 64 miles respectively 103 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 Khinzīrah and Wādī as Sīr has been calculated here.
Air line (approximately)
103 kilometers
55 nautical miles