A package substrate may include an insulating substrate, a circuit pattern and a mold gate pattern. The insulating pattern may have a mold gate region through which a molding member may pass. The circuit pattern may be formed on the insulating substrate. The mold gate pattern may be formed on the mold gate region of the insulating substrate. The mold gate pattern may include a polymer having relatively strong adhesion strength with respect to the insulating substrate and relatively weak adhesion strength with respect to the molding member. Thus, costs of the package substrate and the semiconductor package may be decreased.