Air France shuttle buses (Les Cars Air France) run from Paris-Charles de Gaulle Airport to central Paris seven days a week, departing from ground level between Terminals 2E and 2F.

There are Métro and RATP bus stations and taxi stands at each of the central Paris airport bus stops, allowing you to continue the journey in the city to your hotel or apartment as you wish.

Route 2: Roissy CDG-Porte Maillot-Étoile
Route 2 buses connect Paris-Charles de Gaulle Airport's Terminals 1 and 2 with Porte Maillot (Boulevard Gouvion St Cyr) and Place Charles de Gaulle-Étoile (1, Avenue Carnot) in central Paris (map).

Buses depart the airport every 30 minutes from 05:45 am to 23:00 (11 pm).

The journey takes about 50 to 60 minutes (depending on traffic) and costs 14€ (half price for kids).

Route 3: Roissy CDG-Orly Airport
Route 3 buses connect Paris's two principal airports, traveling from Paris-Charles de Gaulle Airport to Paris-Orly Airport every 30 minutes from 05:55 am to 22:25 (10:25 pm); and from Orly to CDG from 06:30 am to 22:30 (10:30 pm).

The fare is 18€ (half price for kids).

Route 4: Roissy CDG-Gare de Lyon-Gare Montparnasse
Route 4 buses connect Paris-Charles de Gaulle Airport's Terminals 1 and 2 with two of Paris's busiest train stations: Gare de Lyon (20 bis boulevard Diderot) and Gare Montparnasse (rue du commandant Mouchotte) (map).

Buses depart the airport every half hour from 07:00 am to 21:00 (9 pm); they depart Gare Montparnasse (rue du commandant Mouchotte) every 30 minutes from 06:30 am to 21:30 (9:30 pm).

The journey takes 50 to 60 minutes (depending on traffic) and costs 15€ (half price for kids).

Alternatives
The RoissyBus is a similar service from Paris-Charles de Gaulle Airport to the Opéra Garnier in central Paris operated by Paris's RATP transit system. More...

RER suburban trains will take you to central Paris most quickly and inexpensively. More...

An airport shuttle service is another good way to go. More...