Hi Debbie,
Is this for the Chateau weekend tour? If so, at the moment the timings are listed as:
11th Oct Depart St Pancras: 11:31 arrive Paris: 14.47
14th Oct Depart Paris: 17:13, arrive St Pancras: 18.30
Please note however that rail timings are subject to change and will be confirmed in your final documents.
Kindest regards,
Julia