The t+ ticket allows you to travel on the metro, RER in zone 1, Île-de-France region's bus routes (except Orlybus and Roissybus), trams, and the Montmartre funicular.
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Paris RER tickets and fares 2023Adult fare €11.45 walk-up price/€12.40 online with additional booking fee. Child 4-9 €8 walk-up/€8.80 online. CDG Airport is in zone 5 of the Paris public transport system. There are a number of Paris public transport passes (see below).
How Much do the RER Train Tickets Cost from Paris CDG Airport? A one-way ticket for RER B trains costs 11.40€/11.40$ for adult passengers, while an airport ticket for children between 4 and 9 is 8€/8$. Younger children travel for free. Tickets are available at the station's automatic machines and ticket offices.
You can share Paris Metro tickets from booklets of Paris Metro tickets with others traveling together or not. Metro tickets (ticket t+) in booklets are the same as individually sold Metro tickets, but at a discount for bulk purchase. These tickets are otherwise identical to individually sold Metro ticket t+.
Only multi-use Paris Metro/RER passes can be purchased online ahead of time. Single use RER tickets such as for the RER B from CDG to Paris, can only be purchased at ticket windows, offices and vending machines within Paris.
In the metro and RER, tickets are valid for two hours for a single, one-way trip, which might include transfers. It cannot be used for several different trips within this time period. In the bus network, tickets are valid for 90 minutes between the first and last validation, including one or several transfers.
RER C TrainThe RER C line (yellow) will take you from Paris to Versailles for just €3.65 ($4) per person each way. This train travels through Paris from east to west while following the river Seine. Each station is about 10 minutes from the next stop, and the train comes every 15 minutes.
One validated, the t+ ticket allows you to make as many transfers as you want on the metro and RER networks for 90 minutes hours (after the first validation), and for 90 minutes on the bus and tram networks (between the first and last validation).
European travelers should always have some cash on hand; getting it from an ATM abroad is usually the easiest, most advantageous way. If you need cash from an ATM, it's usually better to use a debit card, because credit cards often charge a high interest rate for a cash advance.