The calculated distance (air line) between L'Isle-d'Abeau and Montpellier is approximately 154 miles respectively 248 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-d'Abeau and Montpellier has been calculated here.
Air line (approximately)
248 kilometers
134 nautical miles