RER B Works in Paris: Getting to CDG and Orly This Autumn

Two separate disruptions affect journeys to CDG and Orly until mid-December 2026. They do not overlap in time, but they concern the same travellers.

Since the start of the school year, RER B services have stopped from 10.45pm on weekdays and some weekends between Châtelet-Les Halles and Aéroport Charles de Gaulle 2-TGV / Mitry-Claye. This maintenance work continues until 11 December 2026 inclusive, then a further interruption runs from 14 to 18 December, Monday to Friday from 10.45pm, between Aulnay-sous-Bois and Aéroport Charles de Gaulle 2-TGV. Source: maligneb.fr, the RER B's official information website.

RER B replacement buses run during this window, backed up by the regular line, but with no guaranteed end-to-end timing to the airport. Normal service resumes the following morning. For an evening flight departure or arrival, this interruption directly changes the reference route.

Orly runway 4 has been closed since 10 August 2026 for a full renovation: resurfacing, taxiway junction work, bringing it up to European standards. The works finish on 17 December 2026 inclusive, according to the Ministry for Ecological Transition and Groupe ADP.

Traffic is redirected to the other two runways. Around 3,000 flights are cancelled, delayed or redirected to CDG over the period. Flight paths are temporarily adjusted, but the night curfew from 11.30pm to 6am remains unchanged.

For a traveller departing from Orly, the main impact remains the flight schedule, not the road journey itself. Checking your flight number the day before departure remains the best precaution.

A Paris-CDG or Paris-Orly transfer in the evening already requires timing discipline. With RER B suspended after 10.45pm and schedule adjustments linked to Orly runway 4, the margin for error narrows on certain slots.

A traveller relying on RER B after 10.45pm has two options. Leave before the interruption with a wide margin. Or choose a door-to-door journey without an imposed connection.

A private driver meets this need without variables. Journey calculated according to actual road conditions. Chauffeur in position 10 minutes before departure time, active flight tracking for arrivals. If your flight lands late, your Blackmile chauffeur adjusts their arrival automatically.

• Schedule reliability: a private driver calculates the journey according to actual road traffic. An RATP replacement bus guarantees no end-to-end timing after 10.45pm.
• Total cost: a missed flight costs between €200 and €4,200. A Blackmile Paris-CDG or Paris-Orly journey is fixed at booking, with no dynamic pricing.
• Pick-up: chauffeur at the agreed point, name board, luggage handled. No extra connection linked to the RER B works.
• Airport arrivals: 60 minutes of waiting time offered after actual landing, automatic flight tracking. Useful while Orly runway 4 remains closed and some schedules shift.

For a late departure to CDG airport after 10.45pm, plan for a road journey rather than an RER B connection during this period. For a transfer to Orly, the runway 4 closure changes some flight schedules until 17 December: checking your flight number the day before departure remains worthwhile.

Beyond mid-December 2026, no further major disruption has been officially announced to date on these two routes. Caution remains advisable: works schedules evolve, and checking the day before departure remains the best safeguard.

Across 34,800 rides since 1997, zero Blackmile client has been left without a solution. This statistic is built precisely on the days when public alternatives deteriorate: strikes, works, snow, unplanned events.

A general services department managing dozens of airport journeys a month cannot monitor every RATP or Groupe ADP alert for every employee.

A Blackmile B2B account centralises bookings, includes flight tracking and produces consolidated monthly invoicing. No individual expense claims, no emergency reimbursements, no missed flight to manage in a meeting.

For businesses without a chauffeur service agreement, this end of year is a logical moment to set one up. Disruption at Orly runs until mid-December, RER B disruption until 11 December.