An air guiding system for a vehicle, particularly for a passenger car, is arranged in a rear area of the vehicle and has at least one central main air guiding element that can be displaced between a moved-in inoperative position and a moved-out operative position. Lateral auxiliary air guiding elements are displaceable together with the central main air guiding element. The auxiliary air guiding elements can be adjusted with respect to the main air guiding elements essentially linearly or translatorily in a direction transversely to the longitudinal direction of the vehicle in order to move them from an also moved-in inoperative position into an also moved-out operative position. Each auxiliary air guiding element is guided in a guiding device and is movable along the latter.