The calculated distance (air line) between Saint-Fargeau-Ponthierry and Rouen is approximately 89 miles respectively 143 kilometers.
By car or train, the actual journey to Rouen is certainly longer, as only the direct route (as the crow flies) between Saint-Fargeau-Ponthierry and Rouen has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles