The calculated distance (air line) between Rishon LeTsiyyon and Beersheba is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Beersheba is certainly longer, as only the direct route (as the crow flies) between Rishon LeTsiyyon and Beersheba has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles