CDG Airport from Denfert Rochereau by RER train
So you have successfully arrived at Denfert Rochereau, now here's how to ride the RER to Charles de Gaulle Airport (CDG)...
The station is on the RER B line
You can buy your ticket from the ticket office or from the ticket machines on the left as you enter the station if you have not pre-purchased it.
You must take RER line B in the direction of ' Aéroport Charles de Gaulle' marked B3 and not the other option in the direction of 'Mitry-Claye' marked B5
You enter the RER station via the gates marked for 'Aeroport Charles de Gaulle' and 'Mitry Claye'.As you can see there is 'push through' access hatch for larger luggage on the right and if you have something larger such as a push chair or wheelchair special access can be gained at the right of the entrance to trains in the other direction - but don't worry you will still get to the correct train. This is also the entrance to the metro system.
Remember to keep hold of your ticket as, unlike the metro, you'll need it to exit at your arrival station.
There are two stations at Charles de Gaulle, Paris - the first stop is 'Aeroport Charles de Gaulle1' for Terminal 1 and Terminal 3 and the second stop is ' Aeroport Charles de Gaulle 2 TGV' for Terminal 2, so check which terminal you are departing from.
When you arrive at 'Aeroport Charles de Gaulle1' you are not in fact at Terminal 1 but at 'Roissypole' which is the airport complex which includes bus and train stations, hotels and office blocks. It is fairly straightforward however to reach the terminals.
When you arrive at the station you travel up the escalator following the exit (sortie) signs to the upper level.
Once there, if you are heading for Terminal 1 you follow the signs for the free CDGVAL airport shuttle train which is not far from where you exit.
You need to take the shuttle for 'Parc PR' (car park exit) and Terminal 1.There are only the two stops, plus the station stops are announced in English, so very straightforward.
You will arrive at the shopping level of the airport,which includes Hall 5 & 6,,where you have access to all the other airport facilities, all of which are well signposted.
You can see full plan of Terminal 1 here Paris- Charles de Gaulle aiport Terminal 1 Map
If you have any problems there is an information desk on the next level (departures).
If you need to get to Terminal 3 follow the signs towards the bus station (gare routiere). You have to walk in the open air for part of the journey under a walkway and across a road but even with luggage it should take less than 10 minutes.
If you are flying out from Terminal 2 then you need to stay on until 'Aéroport Charles de Gaulle 2 TGV. You have arrived at Terminal 2 (between terminals 2C/2E and 2D/2F).The train platforms are on level 1 so you have to make your way up to the terminal buildings on level 4
When you arrive at the station you travel up the escalator following the exit (sortie) signs to the large atrium on the upper level...
Through the main train station concourse and continue up to level 4 where you can make your way to your departure terminal.
The Terminal 2 locations (Halls) can be reached by walking and using the moving walkways (quite long). A point to remember is that arrows pointing down on the airport signage mean straight on and not down a level.
You will find signs as to how far you are away from each of the other locations and the station within the Terminal. Longest walking journey is around 20 minutes.
To help plan your trip to your final destination check-out ratp's-interactive-map-here where you will find maps for RER trains, buses, night buses and the Metro.