The calculated distance (air line) between São Mamede de Infesta and Viana do Castelo is approximately 37 miles respectively 59 kilometers.
By car or train, the actual journey to Viana do Castelo is certainly longer, as only the direct route (as the crow flies) between São Mamede de Infesta and Viana do Castelo has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles