The calculated distance (air line) between Santa Cruz do Bispo and Viana do Castelo is approximately 34 miles respectively 55 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 Santa Cruz do Bispo and Viana do Castelo has been calculated here.
Air line (approximately)
55 kilometers
30 nautical miles