The calculated distance (air line) between Old City and Bayt Lāhyā is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Bayt Lāhyā is certainly longer, as only the direct route (as the crow flies) between Old City and Bayt Lāhyā has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles