Kentucky Route 218 begins at the unincorporated Hart County community of Northtown west of Interstate 65 (I-65).

It crosses I-65 at its Exit 58 interchange, and enters the town of Horse Cave, which is part of a tourism hotbed in southern Kentucky due to its proximity to the national park.

About 5 miles (8.0 km) east of downtown Horse Cave, it crosses U.S. Route 31E (Jackson Highway), and then continues eastward to LeGrande, and enters the northernmost section of Metcalfe County a moment after the KY 677 junction.

It begins at an intersection with the Mammoth Cave Parkway near the park's Visitor Center and ends at the I-65 exit 58 interchange with KY 218.

[6][2] Points of interest along Flint Ridge Road include the Mammoth Cave Baptist Church and Cemetery, and the Dennison Ferry Day-use area.