For most travellers, RER B is the simplest public-transport option between Charles de Gaulle Airport and Paris. RoissyBus ended on 1 March 2026, while the official airport fare on RER B is €14 each way.
What changed in 2026
Île-de-France Mobilités ended RoissyBus on 1 March 2026. That makes RER B even more clearly the standard public-transport route into the central network. The line serves the airport and continues through Paris via stations including Gare du Nord and Châtelet-Les Halles.
How much it costs
The Paris Region ↔ Airports ticket costs €14 one way from 1 January 2026. The reduced fare is €7 for eligible passengers. The ticket can be loaded onto Navigo Easy or a compatible smartphone. The normal Metro-Train-RER ticket is not valid for journeys to or from CDG.
Practical rule: if your RER B journey starts or ends at CDG, buy the airport ticket rather than the standard metro/RER ticket.
How long it takes
Île-de-France Mobilités gives an indicative RER B journey time of roughly 25–30 minutes between the airport and Paris, with trains approximately every 6–15 minutes. Your real door-to-door time depends on where you leave the train and whether you need another connection.
Where to get off
- Gare du Nord: useful for northern Paris and connections to other rail services.
- Châtelet-Les Halles: a strong interchange for metro and RER routes in the central area.
- Denfert-Rochereau: useful for destinations in southern Paris.
Choose the station around your actual destination rather than automatically getting off at the first famous stop. Staying on the train a little longer can save an awkward transfer with luggage.
Engineering works and disruptions
RER B is undergoing modernisation work in 2026. During some evening and weekend closures, Express 9517 bus services are reinforced as an alternative. Check current service information from Île-de-France Mobilités on the day you travel, particularly for late-evening trips.
What to do after landing
- Follow signs for RER/Train.
- Check whether your terminal requires an internal transfer to the rail station.
- Buy the €14 Paris Region ↔ Airports ticket unless you already hold a suitable travel pass.
- Check the direction and live service status before boarding.
- Get off at the station that minimises your full journey to the final address.
Bottom line: in 2026, RER B is the default public-transport choice from CDG to Paris: €14, frequent trains and direct access to major central interchanges. Just verify current engineering works before you travel.
