The calculated distance (air line) between Posadas and Jerez de la Frontera is approximately 96 miles respectively 154 kilometers.
By car or train, the actual journey to Jerez de la Frontera is certainly longer, as only the direct route (as the crow flies) between Posadas and Jerez de la Frontera has been calculated here.
Air line (approximately)
154 kilometers
83 nautical miles