Welcome to the territory of Centre and South Yvelines

From 1 January 2024, find the latest news on your lines in the Centre and South Yvelines region on your local news page on the Île-de-France Mobilités website

Your contacts change but your lines remain!

To follow the news and stay informed about your lines in the Centre and South Yvelines territory:

Join our X account (ex-Twitter) @CSYvelines_IDFM
Follow the news on iledefrance-mobilites.fr > News > 78 > Centre and South Yvelines
By phone at 01 34 57 57 57
To purchase your ticket by SMS, text CSY to 93100

To find all the information about your bus lines in the Centre and South Yvelines area, go to iledefrance-mobilites.fr

To calculate a route:

Getting around > Directions

To find the schedules:

Getting around > Schedules > Select a line

To follow local news (only on the site):

News > 78 > Centre and South Yvelines

To subscribe to traffic alerts, we explain everything here!

Which lines are concerned?

All former Transdev Rambouillet lines
Transdev Houdan lines 2, 9, 13, 17, 21, 22, 31, 35, 38, 40, 41, 45, 48, 51, 55, 60, 61, 65, 67 and 67D
Transdev CSO lines 1, 2, 23 and 27
Transdev Ecquevilly lines 14, 17S, 28, 38, 41, 170, 171, 172, 511 and 512
The Keolis N145 line
Line 403 of Francilité Saint Quentin
Routes 36-15, 39-02, 39-07 (A-B-C-D), 39-10, 39-13, 39-17, 39-18, 39-27, 39-28 (A-B-C-D-E-F), 39-35 (A-B), 39-36, 39-38, 39-003, 39-29 (1-2-3-4), 39-30 (A-B-C-D), 39-31, 39-103, 39-203, 39-303, 39-403 and SAVAC's NAV BEL AIR
Lines B, FA, M, P, Q, V, 5, 7, 12, 14 and 19 from Hourtoule

List of Communities of Municipalities and Agglomeration served: Communauté d'Agglomération Rambouillet Territoires, Communauté de Communes Cœur d'Yvelines, Communauté de Communes Gally Mauldre, Communauté de Communes Haute Vallée de Chevreuse, Communauté de Communes du Pays Houdanais, Communauté de Communes du Pays de Limours, Communauté d'Agglomération Saint-Quentin-en-Yvelines, Communauté Urbaine Grand Paris Seine et Oise.