Originally Posted by
MSPeconomist
How are you getting to CDG? IIRC the RER only goes to T2, so you need to allow extra time to get over to T1. It's not walkable.
there are 2 stops for the RER : CDG1 which serves T1 and T3 and the last stop CDG2 which serves T2. But the CDG1 stop is not exactly at T1, so you gave to take the CDGVAL from the station.