The calculated distance (air line) between Franconville and Maisons-Laffitte is approximately 5 miles respectively 7 kilometers.
By car or train, the actual journey to Maisons-Laffitte is certainly longer, as only the direct route (as the crow flies) between Franconville and Maisons-Laffitte has been calculated here.
Air line (approximately)
7 kilometers
4 nautical miles