Roissybus is a special bus service that links the Charles de Gaulle airport and "Opera", in Paris.
The departure points are at the Charles de Gaulle airport: gates 1,2 or 3.  You can also take it at the Auber or Opéra metro station, rue Scribe.
You don’t have to buy tickets. You get them from tickets machines at bus stops.

Timetable valid from Monday to Sunday
Travel time:
45 - 60 minutes
Departure:
Opera (at the angle of rue Scribe and rue Auber)
Departure from the airport to Paris: Stations 1, 2 and 3.
Stops:
Aerogare 1, aerogare 2 and aerogare 3.
Bus intervals:
15 minutes between 6 a.m. - 7 p.m. and 20 minutes
between 7 p.m. - 11 p.m.
Fare: 8.60€
The Paris visit card and the Carte Orange are accepted.
The service is available from 6:00am to 11:00 pm.