The calculated distance (air line) between Ambérieu-en-Bugey and Montpellier is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Ambérieu-en-Bugey and Montpellier has been calculated here.
Air line (approximately)
286 kilometers
154 nautical miles