The calculated distance (air line) between Foz do Douro and São Domingos de Rana is approximately 173 miles respectively 278 kilometers.
By car or train, the actual journey to São Domingos de Rana is certainly longer, as only the direct route (as the crow flies) between Foz do Douro and São Domingos de Rana has been calculated here.
Air line (approximately)
278 kilometers
150 nautical miles