The calculated distance (air line) between Bet Shemesh and Ness Ziona is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Ness Ziona is certainly longer, as only the direct route (as the crow flies) between Bet Shemesh and Ness Ziona has been calculated here.
Air line (approximately)
29 kilometers
15 nautical miles