The calculated distance (air line) between Rishon LeTsiyyon and Rosh Ha‘Ayin is approximately 13 miles respectively 21 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 Rishon LeTsiyyon and Rosh Ha‘Ayin has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles