Paris RER B Closure Cuts Airport Connections Sept. 11 to 13

Paris RER B passengers will lose the central rail connection between Gare du Nord and Denfert-Rochereau from 10:45 p.m. Friday, September 11, through Sunday, September 13, 2026, according to RATP. Separate late evening works extend the interruption toward Charles de Gaulle Airport and Mitry-Claye, making the time of your airport journey as important as its date. For visitors, the decision is whether to use an alternative central Paris connection or plan a replacement bus on the airport leg after the evening cutoff. Treat the usual CDG to central Paris transfer plan as a starting point only, then check the dated works instructions for your actual arrival or departure. Central closure: Gare du Nord to Denfert-Rochereau, September 11 from 10:45 p.m. through September 13. Gare du Nord to Denfert-Rochereau, September 11 from 10:45 p.m. through September 13. Evening extension: Denfert-Rochereau to CDG2 and Mitry-Claye from 10:45 p.m. on September 11, 12 and 13. Denfert-Rochereau to CDG2 and Mitry-Claye from 10:45 p.m. on September 11, 12 and 13. City alternative: Metro line 4 connects the central closure's endpoints; bus 38 is reinforced. Metro line 4 connects the central closure's endpoints; bus 38 is reinforced. Airport replacement: Buses serve CDG1, with CDGVAL onward to CDG2. Buses serve CDG1, with CDGVAL onward to CDG2. Ticket warning: A Bus-Tram ticket is not valid on the RER B replacement buses. Two Closure Patterns Affect the Same Weekend The RATP works notice, updated August 31, identifies a continuous interruption through central Paris beginning late Friday. That means a Saturday or Sunday daytime journey cannot simply remain on RER B between the two named central stations. The RER B operator's detailed evening notice adds a different restriction: from 10:45 p.m. on each of the three nights, trains stop running between Denfert-Rochereau and Aéroport Charles de Gaulle 2-TGV or Mitry-Claye. It also confirms the daytime central interruption on September 12 and 13. This is not evidence that the entire airport branch is closed all day throughout the weekend. A daytime airport journey and a late evening airport journey may therefore need different alternatives, even when they start at the same hotel. Use local Paris time when matching the restrictions to a flight itinerary. A plane landing before 10:45 p.m. does not mean its passengers will reach the rail station before that cutoff, particularly when baggage collection or arrival formalities remain ahead. Metro Line 4 Covers the Central Gap The Paris tourist office's transport works guide names Metro line 4 as a direct alternative between Denfert-Rochereau and Gare du Nord, and says bus 38 will run more frequently. These are ways to cross the central gap, not a promise of an unchanged airport journey time. If a saved route takes you through the interrupted RER section, rebuild it from the station where you will actually start. A hotel near one endpoint has a different problem from a visitor who needs an intermediate stop and then another connection. Allow for finding the alternative platform or street stop rather than comparing only the time spent inside a train or bus. With luggage, a stroller or several people traveling together, an extra interchange can be the part of the journey that makes a tight itinerary unrealistic. Check that the alternative suits the traveler, not just the map. This closure notice does not guarantee step-free access at every interchange or a particular arrangement for a wheelchair user, so passengers needing assistance should verify their specific journey before departure. Late CDG Journeys Need a Bus and Terminal Check The operator describes an airport replacement route running directly between Gare du Nord and Aulnay-sous-Bois, then making intermediate stops toward Aéroport Charles de Gaulle 1. Travelers bound for CDG2 are instructed to continue from CDG1 using CDGVAL. That creates two separate tasks for a departing passenger: reach the correct replacement bus boarding point, then complete the airport terminal transfer. Do not treat arrival at the replacement bus terminus as arrival at your airline's check-in counter. In the other direction, identify the departure point for the Paris-bound replacement service before leaving the terminal area. The operator publishes bus schedules within the detailed works notice, so consult that dated material rather than assuming the replacement will follow the usual RER timetable. The agency explicitly recommends allowing a longer journey, but it does not provide one universal extra-time figure for every origin and destination. Check your route against the airline's required arrival time instead of applying a guessed ten or twenty minute buffer to an ordinary itinerary. A late flight delay can change which transport plan is usable after landing. Keep an alternative route available before boarding for Paris, and check live operating information again when you arrive rather than relying entirely on a screenshot prepared earlier in the week. The Replacement Bus Does Not Use a Bus-Tram Ticket The RER B operator says passengers do not need a special replacement-service ticket: the ticket normally required for their RER journey is the one required on the replacement bus. It expressly states that the Bus-Tram ticket will not be accepted. For a journey to or from Charles de Gaulle Airport, the notice lists an all-zone Navigo pass, Navigo Liberté+ or a Paris Région-Aéroports ticket. The fact that part of the trip takes place on a bus does not remove the airport-specific ticket requirement. Check the product you already hold before buying another one, particularly if you purchased a city travel pass before learning about the closure. The key distinction is between an airport-valid journey and an ordinary city bus ride, not simply the vehicle waiting at the curb. The notice does not establish that every possible combination of metro, replacement bus and other service has identical ticket treatment. If you assemble a different route, verify its ticket requirements separately instead of extending the replacement-bus rule to the whole Paris network. Build the Weekend Around the Actual Transfer Visitors arriving during the day can focus first on the central interruption, while those traveling after the nightly cutoff need to inspect the northern airport segment as well. Write down the changed interchange or boarding point alongside your accommodation details so everyone in the group follows the same plan. If a timed attraction, restaurant booking or onward train follows your airport transfer, revisit that commitment after checking the replacement route. Avoid solving the rail problem with an itinerary that leaves no room for baggage delays or an unfamiliar interchange. A taxi or prearranged road transfer may be an option for some travelers, but these rail notices do not quote road journey times, availability or prices. Compare a current quote and realistic pickup arrangement before assuming a car will be faster or cheaper than the public transport alternative. If you… What to do Cross central Paris on September 12 or 13 Replace the Gare du Nord to Denfert-Rochereau RER segment with a checked alternative. Travel to CDG after 10:45 p.m. Check the airport replacement bus and the CDG1 to CDG2 terminal connection. Hold only a Bus-Tram ticket Obtain the appropriate RER or airport-valid product before using the replacement service. Need step-free travel or assistance Confirm the specific interchange and replacement transport arrangement with the operator. September 11 at 10:45 p.m. is the first closure gate. Match it to when you will reach the transport network, not simply the flight's scheduled touchdown. September 12 and 13 are the daytime central detour gates. Check the Gare du Nord to Denfert-Rochereau connection even if your airport leg is outside the late evening works. Each evening's airport journey needs a fresh check. Confirm the replacement bus timetable, boarding point and terminal transfer before setting out with a fixed departure deadline. No such full-day airport closure is established by these notices. They distinguish the continuous central interruption from the northern branch closures after 10:45 p.m. The tourist office identifies Metro line 4 between Gare du Nord and Denfert-Rochereau. Bus 38 is also reinforced. The operator routes the replacement service to CDG1. It directs CDG2 passengers to continue using CDGVAL. No. The operator requires the appropriate RER journey ticket on replacement buses, with an airport-valid product for CDG travel.