The calculated distance (air line) between Montilla and Jerez de la Frontera is approximately 103 miles respectively 166 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 Montilla and Jerez de la Frontera has been calculated here.
Air line (approximately)
166 kilometers
90 nautical miles