Route 439 begins at an intersection with Union County Route 616 (CR 616) and I-278 near the Goethals Bridge in Elizabeth. The highway progresses westward, passing to the south of the Number 22 Elementary School. The surroundings of the highway are densely populated, with buildings surrounding the highway the entire time. Turning to the northeast, Route 439 intersects with the southern terminus of CR 623 (South Broad Street) and enters the small community of Bayway, for which the highway is named. There, the route intersects with U.S. Routes 1 & 9 (US 1/9) at the Bayway Circle, where it changes monikers to South Elmora Avenue and continues deeper into Elizabeth.