The calculated distance (air line) between Rafaḩ and Bayt Lāhyā is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Bayt Lāhyā is certainly longer, as only the direct route (as the crow flies) between Rafaḩ and Bayt Lāhyā has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles