The calculated distance (air line) between Saint-Quentin-en-Yvelines and Louveciennes is approximately 8 miles respectively 12 kilometers.
By car or train, the actual journey to Louveciennes is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Louveciennes has been calculated here.
Air line (approximately)
12 kilometers
7 nautical miles