A plastic window and an organic light-emitting display apparatus, the plastic window including a first layer; a second layer stacked on the first layer; and coating layers on a bottom surface of the first layer and on a top surface of the second layer, respectively, the top surface of the second layer facing a direction opposite to that of the bottom surface of the first layer, wherein the first layer and the second layer each include polyethylene terephthalate, and the first layer has the same thickness as the second layer.