The calculated distance (air line) between Aver-o-Mar and Vila Nova de Gaia is approximately 21 miles respectively 34 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 Aver-o-Mar and Vila Nova de Gaia has been calculated here.
Air line (approximately)
34 kilometers
19 nautical miles