The calculated distance (air line) between Saint-Quentin-en-Yvelines and Saint-Maur-des-Fossés is approximately 22 miles respectively 35 kilometers.
By car or train, the actual journey to Saint-Maur-des-Fossés is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Saint-Maur-des-Fossés has been calculated here.
Air line (approximately)
35 kilometers
19 nautical miles