By train: From Gare du Nord and Gare de l'Est, take metro line 4 direction Porte d'Orléans and get off at Châtelet Les Halles. Take the RER A, direction Cergy, Poissy, Saint Germain en Laye and get off at Charles de Gaulle-Etoile.
From Gare de Lyon, take RER A direction Cergy, Poissy, St. Germain en Laye and get off at Charles de Gaulle-Etoile.
From Gare Montparnasse, take metro line 6 and get off at Charles de Gaulle Etoile.