The calculated distance (air line) between Ḩalḩūl and Bayt Lāhyā is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Bayt Lāhyā is certainly longer, as only the direct route (as the crow flies) between Ḩalḩūl and Bayt Lāhyā has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles