I am trying to book TGV train from Avignon to Paris CDG on 10/21. The fares are astronomical, and the last train leaves at 17:55 even 3 months out! BUT, on October 15, there is a train departing at 18:52 that is reasonable. However, that train is not on the schedule for October 21. I am wondering if there is a change in schedule that time of year?