A vehicle air guiding system in a rear area of the vehicle has a central air guiding element displaceable between a moved-in inoperative position into a moved-out operative position. Lateral air guiding elements, which are displaceable together with the central air guiding element, are telescopically displaceable relative to the central air guiding element while enlarging the transverse dimension of the air guiding system transversely to vehicle longitudinal direction from an also moved-in inoperative position into an also moved-out operative position. In the inoperative position, the lateral air guiding elements are pushed over the central air guiding element so that they rest against one another by way of the end sections and completely cover or envelop the central air guiding element.