Loudoun County Parkway begins at Braddock Road in South Riding and continues north across U.S. Route 50.

The parkway continues north along the western boundary of Washington Dulles International Airport to the intersection of Old Ox Road.

After crossing Waxpool Road, the parkway continues north through corporate centers and Redskins Park.

The parkway meets SR 7 (Leesburg Pike) at an unnumbered SPUI interchange.

The roadway continues as Riverside Parkway, which parallels SR 7 on its north side west towards Leesburg.