A method of fabricating a flexible display device includes: forming a plastic substrate on a carrier substrate, the plastic substrate including an active area and a non-active area surrounding the active area; forming an array element on the carrier substrate, the array element including a plurality of layers and having an average adhesion force among the plurality of layers; forming a first film on the array element, the first film having a first adhesion force; attaching a flexible printed circuit board to the plastic substrate; forming a second film on the first film, the second film having a second adhesion force greater than the first adhesion force; and detaching the plastic substrate from the carrier substrate.