In early July, my daughter and I are arriving at Barcelona El Prat airport at 7:15 morning after an international flight, and planning to immediately take the next possible AVE train to Sevilla. Since I don't know at this point if the flight will arrive on time or how long it will take us to get to Sants train station, I have not bought tickets, thinking we could buy tickets when we get to the train station. I'm a little concerned it will be more expensive to buy them day-of, or if we should be concerned about not getting seats at all.
I'm wondering if we should buy semi-flexible tickets for later train (like 11:00), then exchanging them for an earlier train if we can. I want to make sure I'm understanding the term "semi-flexible" correctly.
Thanks for any advice!