Paris and Île-de-France transport: Metro and RER disruptions from September 14 to 20, 2026.

An upcoming week looks set to be challenging for travelers on the RATP and SNCF networks. From Monday, September 14 to Sunday, September 20, 2026, the metro, the RER, the Transilien, and the tramway will be affected by works in Paris and across the Île-de-France departments, from Val-d'Oise to Yvelines, via the Essonne and the Seine-et-Marne.

The main disruptions this time focus on the RER and the Transilien, with service outages typically starting in the late evening. Two metro lines will also be suspended on Sunday, September 20. Here’s what to expect, line by line.

Before you set off, it’s wise to check your route in real time on the Île-de-France Mobilités site, or on RATP’s site, or on Transilien SNCF, as travel forecasts can change from day to day.

Metro: Lines 6 and 13 suspended on September 20

On the metro front, Sunday, September 20, will bear the brunt of the disruptions, with two entire lines suspended for modernization work. Two stations will also remain closed for an extended period.

• Line 4 : from September 14 to December 19 inclusive, trains will no longer stop at Saint-Michel due to renovation work. On vous explique cette fermeture de quatre mois ici.
  
  
• Line 6 : on September 20, service is suspended across the entire line for modernization works.
  
  
• Line 8 : until April 22, 2027 inclusive, the République station is not served due to renovation. Tous les détails de ce chantier au long cours.
• Line 13 : on September 20 until 12:00, service is interrupted on the entire line as well for modernization works.

RER: The RER C line racks up a string of outages this week

On the RER network, service disruptions are piling up on weekday evenings, with a particularly busy weekend on lines C and E. The RER C remains the most affected, with outages on almost all of its branches.

• RER A: from September 14 to October 9 inclusive, Monday to Friday after 10 p.m., service is suspended between Nanterre-Préfecture and the Cergy-Le Haut and Poissy branches.

• RER B: from September 15 to 24 inclusive, Monday to Friday from 10:45 PM, service is suspended between Châtelet-Les Halles and the Mitry-Claye and Charles de Gaulle 2-TGV airport branches.

• RER C: through September 25 inclusive, on weekdays from 11 p.m. onward, service will be interrupted between Saint-Quentin-en-Yvelines-Montigny-le-Bretonneux and Javel, and between Versailles Château Rive Gauche and Javel. Through September 18 inclusive, on weekdays from 11 p.m., a closure will occur between Pont de Rungis Aéroport d'Orly and Choisy-le-Roi, and from 10 p.m. between Massy-Palaiseau and Choisy-le-Roi. Through October 2 inclusive, on weekdays from 9:30 p.m., the stretch between Pontoise and Avenue Henri Martin will be interrupted. On September 19 and 20, service is cut between Pontoise and Champ de Mars Tour Eiffel. From September 20 to 27 inclusive, Sundays from 11 p.m., there will be closures between Gare d'Austerlitz and Dourdan-la-Forêt, as well as between Gare d'Austerlitz and Saint-Martin d'Étampes.

• RER D: until September 18 inclusive, Monday to Friday from 23:50, service is interrupted between Juvisy and Corbeil-Essonnes via Ris-Orangis, and from 23:15 between Gare du Nord and Gare de Lyon. Until September 25 inclusive, Monday to Friday from 23:35, there is a closure between Creil and Gare du Nord. From September 14 to 25 inclusive, Monday to Friday from 23:15, disruption between Gare de Lyon and the branches to Melun and to Corbeil-Essonnes. On Saturday the 19th and Sunday the 20th of September from 23:15, there is a cut between Gare de Lyon and Juvisy as well as toward Combs-la-Ville-Quincy.

• RER E: On Saturday, September 19 and Sunday, September 20, 2026, service will be suspended between Nanterre-La-Folie and Tournan due to railway works.

Transilien: lines N and P among the most affected

On the Transilien side, the lines departing from Montparnasse and Gare de l'Est remain the most affected, with daily evening outages that can stretch into December at times. A heads-up if you’re heading home late.

• Line H: through September 18, weekdays from 11:35 p.m., service suspended between Ermont-Eaubonne and Pontoise. Through October 9, weekdays from 9 p.m., disruption between Sarcelles-Saint-Brice and the Luzarches and Persan-Beaumont branches. On September 19 and 20, service is interrupted between Épinay-Villetaneuse and Ermont-Eaubonne.

• Line J: from September 14 to October 16 inclusive, Monday to Friday from 9:40 p.m., there will be a service disruption between Gare Saint-Lazare and Mantes-la-Jolie via Poissy. From September 14 to 18 inclusive, Monday to Friday from 9:00 p.m., there will be a service cut between Conflans-Sainte-Honorine and Mantes-la-Jolie.

• Line L: From September 14 to 25 inclusive, on weekdays from 10:10 p.m., service is suspended between La Défense and the branches of Saint-Nom-la-Bretèche-Forêt de Marly and Versailles Rive Droite. Over the same period, on weekdays from 9:50 p.m., there will be a closure between Sartrouville and Maisons-Laffitte.

• Ligne N : Through September 30 (inclusive), Monday to Friday from 11:40 p.m., service is suspended from Gare Montparnasse to Versailles Chantiers. Through September 18 (inclusive), Monday to Thursday from 11:07 p.m., the line is cut between Gare Montparnasse and Dreux. Through September 25 (inclusive), Monday to Friday from 10:41 p.m., service is suspended between Gare Montparnasse and Plaisir-Grignon. From September 14 to 18 (inclusive), Monday to Friday from 9:30 p.m., the section from Plaisir-Grignon to Mantes-la-Jolie is closed, and from 11:15 p.m. between Gare Montparnasse and Rambouillet. From September 18 to 20 (inclusive), on weekends, traffic is suspended between Plaisir-Grignon and Mantes-la-Jolie.

• Line P: through December 11, on weekdays from 9:30 p.m., service suspended between Gare de l'Est and Provins. Through November 6, on weekdays from 9:15 p.m., disruption between Gare de l'Est and Coulommiers. Through October 16, on weekdays from 9:30 p.m., interruption between Gare de l'Est and Château-Thierry. Through September 18, on weekdays from 9:50 p.m., disruption between Gare de l'Est and Meaux.

• Line R: Through September 18 inclusive, on weekdays from 10 p.m., service is suspended between Melun and Montargis. On September 19 and 20, the section between Moret-Veneux-les-Sablons and Montargis will be closed due to railway works.

• Line U: from September 14 to 18 inclusive, Monday to Friday from 9:20 p.m., service suspended between La Verrière and La Défense.

Tramway: T13 and T14 services suspended in the evenings

The tram lines aren’t spared, with several outright disruptions late in the day. The T3a will be affected on just one evening, Tuesday, September 15.

• T3a : on September 15, from 10 p.m. until the end of service, traffic will be disrupted between Porte d'Italie and Porte de Charenton.

• T4 : through October 21 inclusive, on Tuesdays from 9:15 p.m. to 5 a.m., service is suspended on the entire line.

• T13 : through September 25, inclusive, Monday to Friday from 10 p.m., service interruption across the entire line.

• T14 : From September 14 to 18, inclusive, Monday to Friday, starting at 9:40 p.m., service on the entire line will be suspended.

Replacement Bus Service and Alternative Routes

As with every phase of the works, substitute buses are deployed on most of the cut sections. Their schedules and stops can be consulted on the apps of Île-de-France Mobilités, RATP and Transilien.

To keep track of the network’s day-to-day status, visit our daily briefing on Paris metro, RER, and Transilien traffic, updated in real time. And if you’re moving around the capital only occasionally, our guide on transport-ticket options since the end of the paper ticket will help you choose the most suitable option.

A final point to note for the rest of the month: the visit of pape Léon XIV à Paris on September 25-26, 2026 will entail the closure of several metro stations along the papamobile route. So you can start planning your travels for the following week now.

• To be read
• Best bets for the week of September 14–20, 2026 in Paris and Île-de-France

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