Pennsylvania Route 863 heads northwest from U.S. Route 222 on Independent Road. The route crosses into Weisenberg Township, where it makes a right turn onto Golden Key Road. Shortly after, Pennsylvania Route 863 features an interchange with Interstate 78/U.S. Route 22. The route continues northwest and enters Lynn Township. Near the northern terminus, Pennsylvania Route 863 makes a right onto Allemaengel Road. The road swings to the north and Allemaengel Road splits from Pennsylvania Route 863 by way of a right turn, and the final short stretch of Pennsylvania Route 863 before the intersection with Pennsylvania Route 143 at Lynnport is known as Behler Road.