The RER Paris takes the same tickets and the same passes as the Metro — within central Paris. That's an important distinction, because if you want to go outside of central Paris, you will need a different ticket. (The same applies to Metro tickets.)
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The Metro and RER share the same stations, so you don't need to exit the Metro to transfer to the RER.
RER is an acronymn for Réseau Express Régional, or Regional Express Network, and refers to the rapid transit system which serves Paris and its surrounding suburbs. The RER currently has five lines, A-E, and is operated by an entirely different company than the Paris metro.
Paris RER TicketsWhen taking a RER train strictly within central Paris Zone 1 (visible in the first RER Map), you can use basic Paris Metro tickets for travel on the RER. Travel beyond Paris Zone 1 on the RER requires a special ticket: a Billet Ile-de-France.
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).
I believe that any métro station will sell you an RER ticket to your destination, thus avoiding our little problem. Yes, you can buy your ticket ahead of time if you want - as long as the ticket hasn't been passed through the turnstile, it'll remain valid.
Paris Metro tickets have no expiry; You can use them at any time in the future. Tickets can be purchased from ticket windows inside stations or through automated ticket vending machines accepting Euro coins and smart chip credit cards. The single ticket price as of Jan. 1, 2023 is 2.10€.
Tickets purchased individually or in packages of 10 are permanently valid for single use and are issued without an expiration date. Single tickets can be purchased from metro/RER stations, some bus terminals, and registered retailers, usually tobacconists and bookshops, displaying the RATP sign.
Paris Metro tickets and faresIn the Metro you can use 1 ticket and make any transfers between lines with only that 1 ticket so long as you're underground and in the Metro system itself. Keep it with you until you exit because some Metro or RER stations require it for you to leave.
The Navigo Daily Pass.It is valid for one day, from 12 am to 11.59 pm. You can buy this pass up to 6 days in advance, and it will start working after the first validation and until the end of the metro service that same day. The cost of this pass is 8,45€ (zones 1-2, 2-3, 3-4, 4-5), and 20,10€ (zones 1-5).
The Paris RER is a regional train transport system connecting the center to its surrounding suburbs. RER stands for Réseau Express Régional. The RER also complements the Paris Metro, giving Parisians and tourists a larger transport network in the centre of Paris.
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. Calculate ticket cost from station to station here.
Metro. The Paris Metro is our preferred way to get around the city when we travel around central Paris. This is because it is fast, affordable, has a regular service, and it covers the majority of the attractions in the city centre. The Paris metro system is currently made up of 16 lines and 302 stations.