A RER Ticket is known in Paris as a Billet Origine-Destination, a small paper coupon like train ticket for Paris and surrounding Ile-de-France region priced for the length of the trip, calculated from departure station to arrival station.
Update: RER ticket price ceiling introduced March 1, 2022
RER train tickets are now capped at a maximum ticket price of 5€ for adults and 2.50€ for children ages 4-9. (Except airport trains which are not included in this price cap. RER B from Paris to CDG is still 10.30€.) For example, RER train ticket cost from Paris to Disneyland (Marne la Vallée) is now 5€. Chateau Versailles to Paris is 5€. This maximum price limit for Paris area train tickets also applies to all Transilien trains such as the Transilien L between Gare Saint Lazare and Versailles Rive-Droite (5€) or Gare de Lyon and Fontainebleau (5€).
The information on RER ticket price ceilings is published in French-only on the Ile-de-France Mobilities website Terms and Conditions section here. It reads:
Nouveau : à partir du 01/03/2022, le prix du billet origine-destination plein tarif est plafonné à 4€ en carnet de 10 (soit 40€ le carnet) et à 5€ l’unité quelle que soit la distance parcourue, (20€ le carnet en tarif réduit et 2,50€ à l’unité en tarif réduit). A noter : les billets origine-destination au départ ou à destination de l’aéroport Roissy-Charles de Gaulle ne sont pas soumis à ces tarifs.
New: from March 3, 2022, the price of an origin-destination full fare ticket has a [price ceiling] of 4€ (per ticket) in a booklet of 10 (i.e. 40€ a booklet) and 5€ each regardless the distance traveled, (20€ per discounted booklet [for children 4-9] and 2.50€ each per discounted ticket). Note: origin-destination (RER) tickets departing or arriving at Roissy Charles de Gaulle airport are not included in these fares.
For example, if you were to buy a train ticket from Charles de Gaulle Airport to Paris, you’d buy a RER ticket / billet origine-destination, at a cost of 10.30€ for adults and 7€ for children 9 & under ( as of March 1, 2022).
You can buy RER tickets from ticket windows and ticket vending machines (Billetterie Ile-de-France) at any Paris Metro station, at large train stations (such as Gare de Lyon, Gare du Nord), at RER train stations and Transilien train stations (suburban trains to destinations like Versailles & Fontainebleau).
At train stations there may be several types of ticket windows, one selling RER ticket / Billets Ile-de-France, and others selling tickets for the Grandes Lignes, tickets for TGV and other types of intercity trains. Grandes Lignes ticket windows cannot sell you billets Ile-de-France, so keep this in mind before queuing up to buy train tickets.
Above is a RER Ticket / Billets Ile-de-France ticket office.
This is a Grandes Lignes (TGV, etc.) ticket office.
When buying a RER ticket / billet at a ticket window you can usually just say the word “billet” [“bee-yay”] and the destination such as Paris [“Par-ee”], Aeroport Charles de Gaulle [“Ere-oh-porh Sharl-duh-gall”], Versailles [“vere-sigh”]. Often ticket sellers speak English, at least enough to understand where you’re going.
A one way ticket is known as an Aller-Simple [“Al-Eh somplh”]. Round trip ticket, which are simply two one way tickets, is an Aller-Retour [“Al-Eh Ray-tour”].
A RER ticket / billet Ile-de-France allows connections or transfers to be made onto Metro or RER trains when arriving at Paris. Transfers onto buses or trams however, are not allowed. For those modes of transportation, you’ll need a new Paris Ticket T+.
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