My daughter and I are due to spend the day at Disneyland on Sunday 28th July while other family members travel into central Paris. We noted closures on RER A and the suggested alternative routes. How late will the trains on alternative Vincennes RER & Chateau de Vincennes Metro run. They plan to come back to Disneyland from central Paris around 22.30 will this be possible?
Leaving Paris around 22:30 to get back to Disneyland will be fine, using Paris Metro line 1 then RER A from Vincennes station to Disneyland.
The latest itinerary I would suggest would be boarding Metro 1 at Palais-Royal (just for example, you can use other Metro stations but adjust your time earlier or later depending on if you're further west or east, respectively) at 23:58. This gets you to Chateau de Vincennes at 00:22, then exiting Metro + walking to Vincennes RER on street level will take about 15 min. Last RER A train to arrive at Disneyland will depart Vincennes RER station at 00:44.