The calculated distance (air line) between Sants-Montjuïc and Ciutat Vella is approximately 1 miles respectively 2 kilometers.
By car or train, the actual journey to Ciutat Vella is certainly longer, as only the direct route (as the crow flies) between Sants-Montjuïc and Ciutat Vella has been calculated here.
Air line (approximately)
2 kilometers
1 nautical miles