The calculated distance (air line) between Charneca de Caparica and Barreiro is approximately 7 miles respectively 12 kilometers.
By car or train, the actual journey to Barreiro is certainly longer, as only the direct route (as the crow flies) between Charneca de Caparica and Barreiro has been calculated here.
Air line (approximately)
12 kilometers
6 nautical miles