Reference only — not for real-world navigation.
KCPS
St Louis Downtown Airport · Cahokia/St Louis
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS FREQUENCIES VERIFIED ✅
Field Elevation
413 ft / 126 m
Transition Altitude
18,000 ft
Primary Channel
TWR 119.92 MHz (DOWNTOWN TWR)
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
12R/30L · 6,997 ft · AsphaltLIGHTED12L/30R · 3,800 ft · ConcreteLIGHTED05/23 · 2,799 ft · ASPH-FUNLITFlight Planning
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Welcome to the technical flight briefing for St Louis Downtown Airport (KCPS), located in Cahokia/St Louis, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 3 active runways with a maximum elevation of 413 ft. Instrument approaches (IFR) are supported with verified ILS frequencies and identifiers for precision landings.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
St Louis Downtown Airport
ICAO / IATA
KCPS / CPS
Municipality
Cahokia/St Louis
Country
Region
US-IL — Illinois
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
413 ft
Wikipedia
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 12R / 30L
ILS EQUIPPEDLIGHTED
Runway Length: 6,997 ft / 2,133 m
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 122.2° / 302.2°
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 122.2° / 302.2°
RWY 12R (122.2°)
No ILS / Visual Only
RWY 30L (302.2°)
109.10 MHz
IDENT: CPS | CRS: 302°
Runway 12L / 30R
LIGHTED
Runway Length: 3,800 ft / 1,158 m
Runway Width: 75 ft / 23 m
Surface Type: Concrete
Heading: 122.3° / 302.3°
Runway Width: 75 ft / 23 m
Surface Type: Concrete
Heading: 122.3° / 302.3°
RWY 12L (122.3°)
No ILS / Visual Only
RWY 30R (302.3°)
No ILS / Visual Only
Runway 05 / 23
UNLIT
Runway Length: 2,799 ft / 853 m
Runway Width: 75 ft / 23 m
Surface Type: ASPH-F
Heading: 47° / 227°
Runway Width: 75 ft / 23 m
Surface Type: ASPH-F
Heading: 47° / 227°
RWY 05 (47°)
No ILS / Visual Only
RWY 23 (227°)
No ILS / Visual Only
A/D APP/DEP
123.70 MHz
ATIS ATIS
121.45 MHz
CLD CLNC DEL
121.80 MHz
CTAF CTAF
119.92 MHz
GND GND
121.80 MHz
TWR DOWNTOWN TWR
119.92 MHz
UNIC UNICOM
122.95 MHz
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: FAA NASR · Cycle: Jan 2026