The calculated distance (air line) between Caudebec-lès-Elbeuf and Saint-Quentin-en-Yvelines is approximately 57 miles respectively 92 kilometers.
By car or train, the actual journey to Saint-Quentin-en-Yvelines is certainly longer, as only the direct route (as the crow flies) between Caudebec-lès-Elbeuf and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
92 kilometers
50 nautical miles