ORLYVAL AND RER B
There is a metro shuttle called Orlyval which makes the connection between the airport of Orly and the RER B line.
You will need to take the Orlyval to end station Antony. Then, in Antony, you will need to take the RER B, in direction of Roissy-Charles de Gaulle airport, or Mitry-Claye
One way ticket to Paris costs 12.05€ . You can buy it at the every RER and metro ticket office. More information about the Orlyval
It takes approximately 30 minutes to reach Paris from the airport of Orly.
4 stations of RER B are located in Paris, Denfert Rochereau, St-Michel – Notre Dame, Châtelet – les Halles and Gare du Nord.
AIR FRANCE BUS
There is a bus line, now called Le Bus Direct, which makes the connection from the airport of Orly to the center of Paris. It is available to everybody, even if you are not flying with Air France.
One way ticket to Paris costs 12€ . You can buy it at any Air France office in the airport, or directly from the bus driver.
It takes approximately 1 hour to reach Paris from Orly airport. Departure every 20 minutes from South and West Terminals, from 5.00 AM until 11.40 PM.