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 from a moved-in inoperative position into a moved-out operative position. Lateral auxiliary air guiding elements are displaceable together with each central main air guiding element. The lateral auxiliary air guiding elements can be rotated with respect to each central main air guiding element about a respective pivot fixed to the main air guiding element in order to change them from an also moved-in inoperative position into an also moved-out operative position.