The calculated distance (air line) between Saint-Germain-en-Laye and Triel-sur-Seine is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Triel-sur-Seine is certainly longer, as only the direct route (as the crow flies) between Saint-Germain-en-Laye and Triel-sur-Seine has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles