The calculated distance (air line) between Saint-Germain-lès-Corbeil and Rouen is approximately 85 miles respectively 136 kilometers.
By car or train, the actual journey to Rouen is certainly longer, as only the direct route (as the crow flies) between Saint-Germain-lès-Corbeil and Rouen has been calculated here.
Air line (approximately)
136 kilometers
74 nautical miles