The calculated distance (air line) between Montgat and Horta-Guinardó is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Horta-Guinardó is certainly longer, as only the direct route (as the crow flies) between Montgat and Horta-Guinardó has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles