The most famous and used by tourists is the RER B at a price of € 8.70 can reach the airport in just over half an hour (starting from the Gare du Nord). To take into account that the first train is at 05:00 and last until midnight and a half hours (at intervals of about 15 minutes), and that this is the most subject to delays, inconvenience, crowds for cancellations in case of strikes or events.
