PA 502 begins at an intersection with US 11 in the borough of Moosic in Lackawanna County, heading east-southeast on two-lane undivided Springbrook Avenue.

The road heads through residential and commercial areas, turning east and passing under I-81, where there is a ramp to the northbound direction of that highway.

PA 502 crosses the stream again before passing under I-476 (Pennsylvania Turnpike Northeast Extension) and a Luzerne and Susquehanna Railway line before heading into wooded areas with some homes and turning south.

[2][4] The route heads into Spring Brook Township in Lackawanna County and becomes an unnamed road, winding east through more forests.

The road intersects the western terminus of PA 690 in Rockdale and heads through more woods with some fields and residences, passing through Spring Brook and Yostville.