The calculated distance (air line) between Caudebec-lès-Elbeuf and Lille is approximately 130 miles respectively 209 kilometers.
By car or train, the actual journey to Lille is certainly longer, as only the direct route (as the crow flies) between Caudebec-lès-Elbeuf and Lille has been calculated here.
Air line (approximately)
209 kilometers
113 nautical miles