Cachan is located in Paris city, France at the 48.7963, 2.3366 coordinates. Distance from Cachan to other cities. are listed below, click on the city name to find distance between. Distance from Cachan to Cergy-Pontoise 33 km, to Saint-Quentin-en-Yvelines 23 km, to Boulogne-Billancourt 8 km. The green marker indicates the location of Cachan.