The calculated distance (air line) between Castelo Branco and Vila Nova de Gaia is approximately 108 miles respectively 173 kilometers.
By car or train, the actual journey to Vila Nova de Gaia is certainly longer, as only the direct route (as the crow flies) between Castelo Branco and Vila Nova de Gaia has been calculated here.
Air line (approximately)
173 kilometers
93 nautical miles