The calculated distance (air line) between Bu'ayna-Nujaydat and Ashkelon is approximately 92 miles respectively 147 kilometers.
By car or train, the actual journey to Ashkelon is certainly longer, as only the direct route (as the crow flies) between Bu'ayna-Nujaydat and Ashkelon has been calculated here.
Air line (approximately)
147 kilometers
80 nautical miles