The calculated distance (air line) between Villebon-sur-Yvette and Rouen is approximately 73 miles respectively 117 kilometers.
By car or train, the actual journey to Rouen is certainly longer, as only the direct route (as the crow flies) between Villebon-sur-Yvette and Rouen has been calculated here.
Air line (approximately)
117 kilometers
63 nautical miles