Integrated circuit (IC) package structures, and related devices and methods, are disclosed herein. In some embodiments, an IC package substrate may include: a dielectric layer having a first face and a second face; a metal layer disposed at the first face of the dielectric layer and having a first face and a second face, wherein the second face of the metal layer is disposed between the first face of the metal layer and the second face of the dielectric layer; a package contact at the first face of the metal layer to couple the IC package substrate to a component; and a die contact at the first face of the metal layer to couple a die to the IC package substrate.