The calculated distance (air line) between Portet-sur-Garonne and Nîmes is approximately 149 miles respectively 240 kilometers.
By car or train, the actual journey to Nîmes is certainly longer, as only the direct route (as the crow flies) between Portet-sur-Garonne and Nîmes has been calculated here.
Air line (approximately)
240 kilometers
129 nautical miles