The calculated distance (air line) between Viana do Castelo and Santo António dos Olivais is approximately 104 miles respectively 168 kilometers.
By car or train, the actual journey to Santo António dos Olivais is certainly longer, as only the direct route (as the crow flies) between Viana do Castelo and Santo António dos Olivais has been calculated here.
Air line (approximately)
168 kilometers
91 nautical miles