The calculated distance (air line) between Champagne-au-Mont-d'Or and Montpellier is approximately 157 miles respectively 253 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Champagne-au-Mont-d'Or and Montpellier has been calculated here.
Air line (approximately)
253 kilometers
137 nautical miles