The calculated distance (air line) between Herzliya and Rosh Ha‘Ayin is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Rosh Ha‘Ayin is certainly longer, as only the direct route (as the crow flies) between Herzliya and Rosh Ha‘Ayin has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles