The calculated distance (air line) between Bet Shemesh and Rosh Ha‘Ayin is approximately 25 miles respectively 41 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 Bet Shemesh and Rosh Ha‘Ayin has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles