The calculated distance (air line) between Ciutat Vella and El Prat de Llobregat is approximately 5 miles respectively 9 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 Ciutat Vella and El Prat de Llobregat has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles