The calculated distance (air line) between Jaffa and Rosh Ha‘Ayin is approximately 12 miles respectively 20 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 Jaffa and Rosh Ha‘Ayin has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles