An air deflector for a vehicle underbody is provided. The air deflector includes a fairing having a general convex shape over a width of the fairing and extending a length of the fairing. The fairing is arranged to be affixed to an open end of a generally U-shaped vehicle underbody component to reduce aerodynamic drag experienced during operation of the vehicle. The fairing further includes a plurality of integrated clips positioned on opposite ends of the width of the fairing, the clips arranged to snap over flanged ends of the generally U-shaped vehicle underbody component.