Business travellers who rely on Paris’s RER B to reach Charles-de-Gaulle airport face a week of late-evening disruption that began this weekend. The RATP confirmed on 19 July that all trains between Châtelet–Les Halles and Aéroport CDG 2-TGV—including the Mitry-Claye branch—will be suspended from 22:45 each week-night until 23 July as part of the network’s summer modernisation programme. Replacement buses are being deployed, but journey times to the airport are expected to double in the late evening peak. The interruption comes during France’s high-holiday season, when passenger numbers at CDG routinely top 200,000 per day. Travel-managers have been advised to factor in at least an extra hour when scheduling evening departures or crew rotations. Early-morning long-haul flights are also at risk because the last inbound replacement buses are not timed to guarantee the first wave of check-in desks. For corporates with tight mobility budgets, the closure is a reminder of Paris’s chronic rail-infrastructure bottlenecks. Taxi queues at CDG already lengthen after 22:00, and ride-hail surge pricing can add €30–€40 to the normal €55 flat fare. Companies may wish to pre-book car services or encourage travellers to take earlier trains that clear the closure window. Work on the RER B forms part of a €2 billion upgrade designed to prepare the line for the EOLE extension and expected traffic spikes linked to the 2027 Rugby World Cup and the 2028 Olympic build-up. Further full-line closures are planned between 25 July and 16 August, meaning mobility teams should brace for rolling disruptions throughout the summer.
Source: RATP Traffic Bulletin
