It will take about 40 minutes by taxi (approx €45)
Orlybus: The Orlybus connects Orly to Denfert-Rochereau station in Montparnasse. From there, you can take the RER B line or metro lines 4 and 6. It takes about 30 minutes, the fare is €7.50 and there is a bus every 15-20 minutes. Aquí, el precio no me queda claro si es para el tren o el Orly bus…
Train: Orly Airport is connected to Anthony station by the Orlyval shuttle. It will take you to Gare du Nord in about 40 minutes.
CHARLES DE GAULLE AIRPORT
We are 50 minutes away by taxi (approx €60)
Roissybus: RoissyBus takes travellers from Charles de Gaulle Airport to Place de l’Opéra. It takes 45 to 60 minutes and tickets cost €12 each. The bus runs between 5:45 am and 11:00 pm, every 15-30 minutes.
Rer trains: Line B trains connect Charles de Gaulle Airport to central Paris in approximately half an hour. The most important stops in central Paris are Gare du Nord (25 minutes).
Châtelet – Les Halles (28 minutes) and Denfert-Rochereau (35 minutes). The fare from Charles de Gaulle to the city centre is €9.10 (zones 1-5)