A mountable integrated circuit package system includes: providing a carrier; mounting a first integrated circuit device over the carrier; mounting a substrate over the first integrated circuit device with the substrate having a conductor-free recess; connecting a first electrical interconnect under the conductor-free recess electrically connecting the carrier and the first integrated circuit device; and forming a package encapsulation over the carrier, the first integrated circuit device, the first electrical interconnect, the conductor-free recess, and partially exposing the substrate.