The calculated distance (air line) between Castell-Platja d'Aro and Badalona is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Badalona is certainly longer, as only the direct route (as the crow flies) between Castell-Platja d'Aro and Badalona has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles