From Roissy-Charles de Gaulle airport:
Take the RoissyBus to Paris–Opéra, then take Metro Line 8 (direction Balard) to Madeleine, and change to Line 12 (direction Mairie d’Issy) to Porte de Versailles–Parc des Expositions station
Take the RER B (direction Saint-Rémy-lès-Chevreuse) to Cité Universitaire station, then take tramway T3 (direction Pont du Garigliano) to Porte de Versailles–Parc des Expositions stop.
From Orly airport:
Take the Orlyval train to Antony, then the RER B to Cité Universitaire, change to the tramway T3 and get off at the Porte de Versailles–Parc des expositions stop
Take the Orlybus to Denfert-Rochereau, then the RER B to Cité Universitaire, change to the tramway T3 and get off at the Porte de Versailles–Parc des expositions stop.
