One of the most common ways of getting around Paris is by train. The metro will get you all around the city but to get to/from the airport and Disneyland we used the RER train. The RER only departs from certain stations we started at the opposite end at Nation and it took about 45 minutes with all the stops to arrive at Marne-la-Vallée – Chessy. If you are planning to head to Disney right from the airport you will need to take the RER B into the city and get off at Chatelet Les Halles and transfer over to the A line and take that to Marne-la-Vallée – Chessy. The signs for this station has a Mickey head so you know are going the correct way.
The cost for the one way ticket was 7.60€ for adults and the girls were 3.80€ each which came out to just about $20 usd for the 3 of us. The train did make quite a few stops since we got on at the very 1st stop but each stop was quick before moving on. The very last stop is where you exit for Disneyland Paris and the exit is just steps away from the entrance to the theme parks. If you are staying on property at a DLP resort there are complementary buses located just outside the train station too.