Methods for manufacturing a flexible display device are provided. A flexible substrate is provided and a first bonding pattern, which encloses a display area, is formed on the flexible substrate. A second bonding pattern is formed on a rigid substrate. The first and second bonding patterns are bonded together to provide a bonding pattern between the flexible substrate and the rigid substrate. At least one display device is formed on the display area of the flexible substrate. The bonding pattern is removed by a cutting process performed so as to separate the flexible substrate having the display device thereon from the rigid substrate.