RER A
running late?
Live traffic and next trains on the RER A (Cergy le Haut ↔ Boissy-Saint-Léger).
🔄 Updated at 03:44
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RER A: normal traffic right now.
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RER A delays: is the line disrupted?
This page checks live whether the RER A (RER A, from Cergy le Haut to Boissy-Saint-Léger) has a delay, breakdown or disruption: passenger incident, engineering works, signal failure, traffic regulation… The status and message come from Île-de-France Mobilités' real-time traffic info, not from an estimate. Pick your station to see the next RER in each direction.
👉 See also every disrupted line, live.
RER A: the essentials
- 🚉 46 stations, from Cergy le Haut to Boissy-Saint-Léger.
- 🔀 Termini: Cergy le Haut, Boissy-Saint-Léger, Saint-Germain-en-Laye, Marne-la-Vallée - Chessy, Poissy, Torcy.
- ⏱ End-to-end journey: ≈ 78 min.
- 🔁 An RER every ~3 min during the day (weekdays).
- 🕐 On weekdays, first departure around 04:41, last around 00:15 (planned timetable).
- 📍 Towns served: Cergy, Neuville-sur-Oise, Conflans-Sainte-Honorine, Achères, Maisons-Laffitte, Sartrouville, Houilles, Nanterre, Puteaux, Paris, Vincennes, Fontenay-sous-Bois…
Connections
Stations on the RER A: next trains
- Cergy le Haut
- Cergy Saint-Christophe
- Cergy Préfecture
- Neuville - Université
- Conflans Fin d'Oise
- Achères Ville
- Maisons-Laffitte
- Sartrouville
- Houilles - Carrières-sur-Seine
- Nanterre - Préfecture
- La Défense
- Charles de Gaulle - Étoile
- Auber
- Châtelet - Les Halles
- Gare de Lyon
- Nation
- Vincennes
- Fontenay-sous-Bois
- Nogent-sur-Marne
- Joinville-le-Pont
- Saint-Maur - Créteil
- Le Parc de Saint-Maur
- Champigny
- La Varenne - Chennevières
- Sucy - Bonneuil
- Boissy-Saint-Léger
- Nanterre Université
- Nanterre - Ville
- Rueil-Malmaison
- Chatou - Croissy
- Le Vésinet - Centre
- Le Vésinet - Le Pecq
- Saint-Germain-en-Laye
- Val de Fontenay
- Neuilly-Plaisance
- Bry-sur-Marne
- Noisy-le-Grand - Mont d'Est
- Noisy - Champs
- Noisiel
- Lognes
- Torcy
- Bussy-Saint-Georges
- Val d'Europe
- Marne-la-Vallée - Chessy
- Achères Grand Cormier
- Poissy
Frequently asked questions — RER A
How can I tell if the RER A is delayed?
Open this page: the live status of the RER A appears straight away, based on Île-de-France Mobilités' official traffic info (“IT'S A MESS” when it's disrupted, with the reason and the announced end time, “ALL GOOD” otherwise). Then pick your station for the next trains.
When is the next RER on the RER A?
Pick your station: the next trains appear in real time in each direction (towards Cergy le Haut, Boissy-Saint-Léger, Saint-Germain-en-Laye, Marne-la-Vallée - Chessy), refreshed every 30 seconds.
What time is the first and last RER on the RER A?
According to the planned timetable, on weekdays the first RER leaves at 04:41 from Cergy le Haut and at 05:01 from Boissy-Saint-Léger; the last leaves at 21:34 from Cergy le Haut and at 00:15 from Boissy-Saint-Léger. For your station, ask the AI: “last RER from …”.
How long does it take from Cergy le Haut to Boissy-Saint-Léger?
About 78 minutes end to end on the RER A (46 stations), based on official IDFM timetables. For a specific trip between two stations, use the journey time calculator.
How often does the RER A run?
During the day on weekdays, an RER comes every 3 minutes on average on the central section (less often on the branches). The actual next trains are shown on this page.
Is the RER A often disrupted?
Like any line on the network, the RER A has its share of incidents, engineering works and traffic regulation. This page shows the actual status right now (updated continuously), not an average.