Overview
RER Line B connects the airport to central Paris and Orly airport. There are two stations at the airport - one serving Terminal 3 and the other, Terminal 2 and the TGV station. Terminal 1 is accessible from either by people-mover: Terminal 3 is closer. See https://www.parisaeroport.fr/en/passengers/access/paris-charles-de-gaulle/public-transport/rer-b for more information. In February 2022, fare was €11.40, journey time was around 25 minutes and train frequency was every 10-15 minutes. Passengers are recommended to take a limited-stop train, rather than one serving all intermediate stations.
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