Well?
If the tires are under the puncture warranty, they should be replaceable for free or with a possible small charge for tax/disposal fees depending on where you are.
https://www.youtube.com/watch?v=DeYS_DQsGYY
Depends on what caused the flat. Was it a defect or did you run over something?
Dealership called me. They said "valve steam" leak. They replaced tire at no charge. So they effed up.
Nice. With a defect, its definitely their responsibility. Running over a nail or something would have just been bad luck.