The calculated distance (air line) between Bnei Ayish and Modiin Ilit is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Modiin Ilit is certainly longer, as only the direct route (as the crow flies) between Bnei Ayish and Modiin Ilit has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles