I have 4 adults traveling from Paris to Rouen and back a few days later in mid-March. We are still working on our itinerary. How far in advance to I need to purchase rail tickets?
This past trip I went to Rouen as a day trip from Paris. This was in July and bought the ticket the night before.
I had to indicate my age, (early '70s) that of a senior, don't know if any sort of discount kicked in.
There are various prices depending on the time of departure, bought the ticket using the "tap" function from a SNCF machine in Gare du Nord.