How long is the train ride from terminal 1 to down town Paris and how much does it cost?
The RER B train is actually not inside Terminal 1, but Roissypole building, so you need to take CDGVAL shuttle train to Roissypole first. The RER B train from this station CDG to Paris-Gare du Nord is about 35-40 minutes. Chatelet les Halles is about another 3 minutes. Price is 10.30€ as of 2020.