The calculated distance (air line) between Mevasseret Tsiyyon and Ashdod is approximately 29 miles respectively 47 kilometers.
By car or train, the actual journey to Ashdod is certainly longer, as only the direct route (as the crow flies) between Mevasseret Tsiyyon and Ashdod has been calculated here.
Air line (approximately)
47 kilometers
26 nautical miles