The calculated distance (air line) between Saint-Julien-les-Villas and Rouen is approximately 159 miles respectively 255 kilometers.
By car or train, the actual journey to Rouen is certainly longer, as only the direct route (as the crow flies) between Saint-Julien-les-Villas and Rouen has been calculated here.
Air line (approximately)
255 kilometers
138 nautical miles