The calculated distance (air line) between Castelões de Cepeda and Barreiro is approximately 180 miles respectively 289 kilometers.
By car or train, the actual journey to Barreiro is certainly longer, as only the direct route (as the crow flies) between Castelões de Cepeda and Barreiro has been calculated here.
Air line (approximately)
289 kilometers
156 nautical miles