ENSTA is located at equal distance from subway stations Porte de Versailles (line 12 direction Mairie d'Issy) and Balard (end station of the line 8).

From Orly airport :

Take the RER B, direction Paris/Roissy Aéroport. Change train at Denfert Rochereau station, take the line 6 direction Etoile. Change again at Pasteur station and take the line 12 direction Mairie d'Issy.

From Roissy Airport :

take the RER B direction Robinson - Saint-Rémy. Change at Denfert Rochereau station and take the line 6, direction Etoile. Change again at Pasteur station and take the line 12 direction Mairie d'Issy.

See also plan of: Google Map