The calculated distance (air line) between Vaison-la-Romaine and Montpellier is approximately 74 miles respectively 119 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Vaison-la-Romaine and Montpellier has been calculated here.
Air line (approximately)
119 kilometers
64 nautical miles