The calculated distance (air line) between Nanterre and Saint-Germain-en-Laye is approximately 5 miles respectively 9 kilometers.
By car or train, the actual journey to Saint-Germain-en-Laye is certainly longer, as only the direct route (as the crow flies) between Nanterre and Saint-Germain-en-Laye has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles