The calculated distance (air line) between Marly-le-Roi and Saint-Germain-en-Laye is approximately 2 miles respectively 3 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 Marly-le-Roi and Saint-Germain-en-Laye has been calculated here.
Air line (approximately)
3 kilometers
2 nautical miles