A window transfer method and a window manufacturing method using a window transfer method are provided. A window transfer method includes preparing a stage, transferring the stage over a loading part on which a window layer is loaded, transferring the stage to be adjacent to an upper surface of the window layer and to allow a plurality of protrusion parts attached to side surfaces of the stage to press a slip sheet layer arranged under the window layer and exposed outside the window layer, and suctioning the window layer to a lower surface of the stage to separate the window layer from the slip sheet layer.