The calculated distance (air line) between Canet-en-Roussillon and Montpellier is approximately 76 miles respectively 123 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Canet-en-Roussillon and Montpellier has been calculated here.
Air line (approximately)
123 kilometers
66 nautical miles