The calculated distance (air line) between Santa Coloma de Gramenet and Sant Boi de Llobregat is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Sant Boi de Llobregat is certainly longer, as only the direct route (as the crow flies) between Santa Coloma de Gramenet and Sant Boi de Llobregat has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles