The calculated distance (air line) between Portet-sur-Garonne and Montpellier is approximately 124 miles respectively 199 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Portet-sur-Garonne and Montpellier has been calculated here.
Air line (approximately)
199 kilometers
108 nautical miles