The calculated distance (air line) between Tibnah and Wādī as Sīr is approximately 36 miles respectively 58 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 Tibnah and Wādī as Sīr has been calculated here.
Air line (approximately)
58 kilometers
32 nautical miles