The calculated distance (air line) between Zaragoza and El Prat de Llobregat is approximately 155 miles respectively 250 kilometers.
By car or train, the actual journey to El Prat de Llobregat is certainly longer, as only the direct route (as the crow flies) between Zaragoza and El Prat de Llobregat has been calculated here.
Air line (approximately)
250 kilometers
135 nautical miles