My sister and I will be heading to the Christmas markets in late November/early December, and we will be spending 2 nights in Strasbourg, and would like to visit Colmar's market as well. it looks like the TER trains run pretty regularly between the two places, so it seems like that would be the best mode of transportation to get there and back.
But how early do I need to book train tickets? I don't mind booking the train from Strasbourg to Colmar fairly early, since we'll pretty much know when we want to go there. But if we want to come back to Strasbourg early or stay later in Colmar, would we have any problem changing the ticket? Or is it better to just wait and book it then? But if we do that, is there a risk of not getting seats?
I was on the TER website and couldn't even change the date from today's date to when I wanted to book it, so I left there to go to SNCF. But I'm still a little confused about how flexible the tickets are.
I would appreciate any help! Thanks!