An air guiding system for a vehicle, particularly for a passenger car, is arranged in a rear area of the vehicle and has a main air guiding element that can be displaced from a moved-in inoperative position into a moved-out operative position. Viewed in the longitudinal direction of the vehicle, the main air guiding element, while forming at least two main air guiding element sections, is divided such that, when the main air guiding element is displaced from the inoperative position into the operative position, at least lateral main air guiding element sections can be moved transversely to the longitudinal direction of the vehicle.