The calculated distance (air line) between Ramallah and Bayt Lāhyā is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Bayt Lāhyā is certainly longer, as only the direct route (as the crow flies) between Ramallah and Bayt Lāhyā has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles