- Southern Terminus:
- Broadway (US 9) in Tarrytown
- Northern Terminus:
- I-684 and Cross River Road (NY 35) in Katonah
- 15.57 miles
NY 117 begins at Broadway (US 9) in Tarrytown. The first section is a short expressway called Phelps Way that runs through Rockefeller State Park Preserve. After a couple of miles, Phelps Way ends, and NY 117 continues along Bedford Road, which is designated NY 448 south of this point. There is an interchange with the Taconic Parkway. After a short distance, NY 117 turns onto Manville Road, while Bedford Road continues northeast as CR 27A and CR 27. NY 117 follows Manville Road through Pleasantville and then turns north again onto Bedford Road. NY 117 runs northeast, next to the Saw Mill Parkway, through Chappaqua and Mount Kisco to Katonah, where it merges with the parkway. NY 117 and the Saw Mill Parkway end together at I-684 and Cross River Road (NY 35) in Katonah.