It spans 156 miles (251 km) beginning at the Louisiana/Texas state line west of Leesville and ending at an intersection with U.S. Route 425 and LA 15 in Sicily Island.

From the west State Highway 63 becomes LA 8 after crossing the Sabine River near Burr Ferry.

[2] At the Burr's Ferry Bridge in Vernon Parish, LA 8 heads east, and merges with U.S. Highway 171 north in Leesville.

In Rapides Parish, LA 8 continues northeastward, passing north of Lake Rodemacher, and merges with I-49 for approximately a mile.

LA 8 then splits from I-49 after approximately a mile and passes through Boyce and heads due north, crossing the Red River into Grant Parish.