The calculated distance (air line) between Rillieux-la-Pape and Montpellier is approximately 160 miles respectively 258 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Rillieux-la-Pape and Montpellier has been calculated here.
Air line (approximately)
258 kilometers
139 nautical miles