What's the current traffic situation on the RER B? Here's real-time information on current and future disruptions on this public transport line in the RATP-SNCF network. Work, incidents, demonstrations, strikes, industrial action - here's what to expect.
Linking the north and south of theParis region over an 80-kilometer route, the RER B opened in 1977 and today serves 47 stops, connecting residential and business areas across various départements. To the north, it departs fromCharles de Gaulle airport and Mitry-Claye in Seine-et-Marne, passing through Seine-Saint-Denis with key stops such as Aulnay-sous-Bois. Heading south, it reaches Saint-Rémy-lès-Chevreuse in the Yvelines to take us to the sublime Vallée de Chevreuse, crossing theEssonne with stops including Orsay and Bures-sur-Yvette.
In Paris, the RER B crosses several central arrondissements, offering direct access to points of interest such as the Latin Quarter and Jardin du Luxembourg in the 5th arrondissement, and the famous Parc Montsouris in the 14th. It also connects with the Stade de France in Saint-Denis, and the Villepinte exhibition center. The line also offers multiple connections with other RER lines(A, C, D, E) and several metro lines(4, 6, 10, 14).
If you're a regular user of this line in the RATP-SNCF network, here's where we share real-time information on traffic on the RER B public transport network in the Paris region. Whether it's work in progress, station closures, strikes orunforeseen incidents, we'll give you the lowdown on current and future disruptions on the RER B in Paris and the Ile-de-France region.
- RER B: Aulnay-sous-Bois <-> Mitry-Claye on 02-03/05 and 30-31/05:
Period: weekends, all day.
Dates: from Saturday, May 2 to Sunday, May 3 and from Saturday, May 30 to Sunday, May 31.
Traffic will be interrupted between Aulnay-sous-Bois and Mitry-Claye.
A replacement bus service will operate, with stops at intermediate stations.
Reason: railway works. - RER B: Châtelet <-> CDG2 Airport - Mitry - Claye 05/01-28/05:
Period: Weeknights starting from 10:45 PM.
Dates: From Monday, January 5th to Thursday, May 28th, excluding February 5th, April 6th, and May 1st, 8th, 14th, 15th, and 25th, 2026.
- Service between Châtelet Les Halles and Aéroport Charles de Gaulle 2 will be suspended.
- Service between Châtelet Les Halles and Mitry—Claye will also be disrupted.
A replacement bus service will operate from Gare du Nord during this period.
For more details, visit the RER B website.
Reason: railway network maintenance. - RER B : trafic fortement perturbé sur toute la ligne :
Le trafic est fortement perturbé sur l'ensemble de la ligne.
Pour plus d'informations sur cette perturbation, consultez le fil X du RER B.
Motif : individus sur les voies à La Courneuve. - RER B: Paris Nord <-> CDG2/Mitry - Claye Airport from 8 to 10 May:
Period: Fridays, Saturdays and Sundays, all day.
Dates: from Friday the 8th to Sunday the 10th of May.
Traffic is suspended between Paris Gare du Nord and CDG Terminal 2, and between Aulnay-sous-Bois and Mitry-Claye.
Alternative arrangements have been put in place. - RER B: Châtelet to CDG2 Airport / Mitry - Claye, from January 5th to May 28th
Period: Weekdays from 10:45 PM onward.
Dates: From Monday, January 5th to Thursday, May 28th, excluding February 5th, April 6th, and May 1st, 8th, 14th, 15th, and 25th, 2026.
Traffic will be interrupted between Châtelet Les Halles and Aéroport C De Gaulle 2, as well as between Châtelet Les Halles and Mitry–Claye.
A replacement bus service will be available from Gare du Nord. For more information, visit the RER B website.
Reason: railway network maintenance. - RER B: Châtelet to CDG2 Airport - Mitry-Claye
05/01 - 28/05:
Schedule: Weeknights starting at 10:45 PM.
Dates: From Monday, January 5th to Thursday, May 28th, excluding February 5th, April 6th, and May 1st, 8th, 14th, 15th, and 25th, 2026.
Services will be suspended between Châtelet Les Halles and Aéroport C. De Gaulle 2, as well as between Châtelet Les Halles and Mitry - Claye.
A replacement bus service will operate from Gare du Nord. For more details, visit the RER B website.
Reason: railway network maintenance. - RER B: Paris Nord <-> CDG Terminal 2 / Mitry - Claye, 23–25 May:
Period: on weekends, all day.
Dates: from Saturday the 23rd to Monday the 25th of May inclusive.
Traffic is suspended between CDG Airport Terminal 2 and Paris Nord, and between Mitry-Claye and Paris Nord.
An alternative transport service is being provided. - RER B: Paris Nord <-> CDG Terminal 2 / Mitry-Claye 23–25 May:
Period: weekends, all day.
Dates: from Saturday 23 to Monday 25 May inclusive.
Traffic is suspended between CDG Terminal 2 and Paris Nord, and between Mitry-Claye and Paris Nord.
An alternative transport service is in place. - RER B: Paris Nord <-> CDG Terminal 2 / Mitry - Claye 23-25/05:
Period: weekends, all day.
Dates: from Saturday, May 23 to Monday, May 25 inclusive.
Traffic is suspended between CDG Terminal 2 and Paris Gare du Nord, and between Mitry–Claye and Paris Gare du Nord.
An alternative transport service will be provided. - RER B: Châtelet <-> CDG2 Airport, Mitry-Claye | May 1 - May 28:
Schedule: Weeknights starting from 10:45 PM.
Dates: From Monday, January 5th to Thursday, May 28th, excluding February 5th, April 6th, and May 1st, 8th, 14th, 15th, and 25th, 2026.
Train services will be suspended between Châtelet Les Halles and Aéroport C. De Gaulle 2 and between Châtelet Les Halles and Mitry - Claye.
A replacement bus service will operate from Gare du Nord. For more details, visit the RER B website.
Reason: railway works. - RER B: Aulnay-sous-Bois <-> Mitry-Claye May 2–3 and May 30–31:
Period: on weekends, all day long.
Dates: from Saturday 2 May to Sunday 3 May and from Saturday 30 May to Sunday 31 May.
Traffic is interrupted between Aulnay-sous-Bois and Mitry - Claye.
A replacement bus service will be in operation, serving the intermediate stations.
Reason: railway works.
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