New at Paris-Saclay: buses in the evening and on Sundays too!

These changes, carried out in consultation with the Paris-Saclay Agglomeration Community, aim to offer passengers continuity of service and allow travel every day of the week.

Initiated in April 2025 with the restructuring of the Massy <> Les Ulis lines via Courtabœuf, the overhaul of the lines in the Paris Saclay area is continuing. Eventually, a dozen lines will have evolved to better serve the territory, its inhabitants and its jobs.

From 19 October, new changes are being implemented. They concern more particularly the municipalities of Gif-sur-Yvette, Orsay and Les Ulis:

·        The 4611 line will see its service extended until 00:15 from Monday to Saturday and until 22:40 on Sunday.

·        Line 4627 will have a new offer on Sundays with a passage every 30 minutes between 6 a.m. and 9:30 p.m.

·        The 9108 Express line will have an extended service until 10 p.m. on weekdays and a service every 45 minutes until 9 p.m. on Saturdays. In addition, there is a new offer on Sundays with one bus per hour between 11 a.m. and 6 p.m.

Line 4611 reinforced to better serve Gif-sur-Yvette and Chevry

Line 4611 mainly serves the town of Gif-sur-Yvette. From October 19, 2026, the evening offer will be extended and will make it easier for the inhabitants of Chevry to return from Paris. From Monday to Saturday, the service is extended until 00:15 from Monday to Saturday and until 22:40 on Sunday. The departure times from Gif-sur-Yvette station are set with the theoretical schedules of the RER B coming from Paris.

Buses on Sundays on line 4627 to facilitate access to the Paris-Saclay Hospital

Since June 2024, the Nord Essonne Hospital Group (GHNE) has moved its local branches to the new building located on the Saclay plateau. In order to make it easier for people to travel to the new Paris-Saclay Hospital, line 4627 was created on September 15, 2025 between Les Ulis and Palaiseau (Polytechnique district).

In order to offer a public transport access solution to the Paris-Saclay hospital, particularly for visits, an offer on Sundays has been set up. The line will run from 6 a.m. to 9:30 p.m. on Sundays, with a passage every 30 minutes.

In addition, the line has also served the "Université Paris-Saclay" stop since 18 May, offering an alternative to travel between Les Ulis and the Saclay plateau and access to the Ulis 2 shopping centre for students.

Reinforcement of the 9108 Express line to adapt to the needs of students and employees

This line provides access to the Saclay plateau from Vélizy 2 and Les Ulis. It serves both the Moulon district (Paris-Saclay University sector) and the Polytechnique district. During the week, the service stopped around 8 p.m. and was not adapted to the needs of students and employees. It now runs until 10 p.m. with a departure every 30 minutes from Les Ulis and Polytechnique Vauve, thus offering a passage every 15 minutes at the Université Paris-Saclay stop in the direction of Vélizy 2.

On Saturdays, the transport offer is reinforced with a passage every 45 minutes compared to 60 minutes currently. The amplitude is also extended in the evening until 9 p.m.

On Sundays, an offer is created between 11 a.m. and 6 p.m., allowing access to the Vélizy 2 regional shopping center.

Keep your eyes open, communication will be present on the passenger shelters!

To find out all about these new features, find us at the stops:

• Monday 5/10: Vélizy 2, 7:30 am - 9:30 am
• Tuesday 6/10: Gif sur Yvette station, 4 pm - 6 pm
• Wednesday 7/10: Paris Saclay Hospital, 9am - 11am
• Thursday 8/10: Paris-Saclay University, 4 pm - 6 pm
• Friday 9/10: Mairie des Ulis, 7:30 am - 9:30 am
• Monday 12/10: Gif sur Yvette station, 4 pm - 6 pm
• Tuesday 13/10: Paris Saclay Hospital, 3 pm - 5 pm
• Wednesday 14/10: Paris-Saclay University, 4 pm - 6 pm
• Thursday 15/10: Vélizy 2, 7:30 am - 9:30 am
• Friday 16/10: Mairie des Ulis, 4 pm - 6 pm