Missouri Route 109

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Route 109
MO 109 highlighted in red
Route information
Maintained by MoDOT
Length	13.128 mi[1] (21.127 km)
Major junctions
South end	Route W / Route FF in Jefferson County
Major intersections	I-44 / US 50 in Eureka Route 100 in Wildwood
North end	Route CC (Wild Horse Creek Road) in Chesterfield
Location
Country	United States
State	Missouri
Counties	Jefferson, St. Louis County
Highway system
Missouri State Highway System Interstate US State Supplemental
← Route 108 → Route 110 (CKC)

Route 109 is a state highway in St. Louis County, Missouri and Jefferson County, Missouri. Its northern terminus is at Wild Horse Creek Road in Chesterfield; its southern terminus is at Routes W and FF in Jefferson County. The road continues north, curves around Spirit of St. Louis Airport and connects with Chesterfield Airport Road, providing a "backway" to the Chesterfield area.