The calculated distance (air line) between L'Isle-Jourdain and Montpellier is approximately 140 miles respectively 225 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between L'Isle-Jourdain and Montpellier has been calculated here.
Air line (approximately)
225 kilometers
121 nautical miles