The calculated distance (air line) between Rishon LeTsiyyon and Herzliya is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Herzliya is certainly longer, as only the direct route (as the crow flies) between Rishon LeTsiyyon and Herzliya has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles