The calculated distance (air line) between Foz do Douro and Figueira da Foz is approximately 70 miles respectively 112 kilometers.
By car or train, the actual journey to Figueira da Foz is certainly longer, as only the direct route (as the crow flies) between Foz do Douro and Figueira da Foz has been calculated here.
Air line (approximately)
112 kilometers
61 nautical miles