TGV trains -should I book in advance?

[JazzyMe]

We are doing TGV train after landing in CDG airport? Should I book tickets in advance online or could I buy them after landing in airport?

Our flight is on Monday, so it shouldn't be crowded, but I would like to know in advance.

 

[Michael623]

I bought when we got there and had no problems. If I was going to be there Monday I'd do the same thing.

 

[emanlu]

I bought our tickets to Disney from the station at CDG when we arrived as I was worried about being delayed - I had however bought our return journey tickets from Rail Europe before we left.