The calculated distance (air line) between Nantes and Saint-Sébastien-sur-Loire is approximately 2 miles respectively 4 kilometers.
By car or train, the actual journey to Saint-Sébastien-sur-Loire is certainly longer, as only the direct route (as the crow flies) between Nantes and Saint-Sébastien-sur-Loire has been calculated here.
Air line (approximately)
4 kilometers
2 nautical miles