The calculated distance (air line) between Nantes and Saint-Brevin-les-Pins is approximately 29 miles respectively 46 kilometers.
By car or train, the actual journey to Saint-Brevin-les-Pins is certainly longer, as only the direct route (as the crow flies) between Nantes and Saint-Brevin-les-Pins has been calculated here.
Air line (approximately)
46 kilometers
25 nautical miles