RER B
There are 2 RER B stations in the airport, Aéroport Charles-de-Gaulle 1 which serves terminals 1 and 3, and Aéroport Charles-de-Gaulle 2 located next to terminal 2.
Price
One way ticket to Paris costs 9.50€. You can buy it at the entrance of the RER stations or in any metro ticket office.
Timetable
It takes approximately 30 minutes to reach Paris from the airport of Roissy-Charles de Gaulle.
4 stations of RER B are located in Paris, Gare du Nord, Châtelet – les Halles, St-Michel – Notre Dame and Denfert Rochereau.