The calculated distance (air line) between Modiin Ilit and Hod HaSharon is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Hod HaSharon is certainly longer, as only the direct route (as the crow flies) between Modiin Ilit and Hod HaSharon has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles