The calculated distance (air line) between Saint-Pierre-lès-Elbeuf and Rouen is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Rouen is certainly longer, as only the direct route (as the crow flies) between Saint-Pierre-lès-Elbeuf and Rouen has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles