The calculated distance (air line) between Saint-Brice-sous-Forêt and Rouen is approximately 64 miles respectively 103 kilometers.
By car or train, the actual journey to Rouen is certainly longer, as only the direct route (as the crow flies) between Saint-Brice-sous-Forêt and Rouen has been calculated here.
Air line (approximately)
103 kilometers
56 nautical miles