Airport CDG isn't exactly close to Paris. The
RoissyBus from CDG to Paris will take about 45 minutes to travel from CDG to Opera without traffic, 60 minutes with heavy traffic. I wouldn't say RER B train + RER A train is much quicker, about 45 minutes.
See
RER B train to Paris for more information on taking the train. Transfer at Chatelet Les Halles station to the RER A train line direction: Saint Germain-en-Laye (or Cergy or Poissy) until Opera station (using the same ticket as for the RER B).
Best regards,
Ben
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