Cahokia/St Louis, Illinois
KCPS St Louis Downtown
St Louis Downtown (KCPS) is a towered, public-use airport in Cahokia/St Louis, Illinois, at 412.9 ft MSL. It has 3 runways: 05/23 (2,799 by 75 ft, asphalt), 12L/30R (5,301 by 75 ft, concrete), 12R/30L (7,002 by 150 ft, asphalt). Right traffic for runways 30R, 12R. CTAF 119.925.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- ICAO KCPS, FAA CPS
- Location
- Cahokia/St Louis, Illinois (St Clair County). 1 NM E of the city center
- Elevation
- 412.9 ft MSL
- Position
- 38.5704° N, 90.1551° W
- Control tower
- Yes (ATCT)
- Sectional chart
- St Louis
- Magnetic variation
- 0° E (2000)
- Fuel
- 100LL, Jet A
- Ownership
- Publicly owned, open to the public
- Attendance
- Daily ALL
3 runways
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 05/23 | 2,799 × 75 ft | Asphalt, fair condition | Medium intensity |
| 12L/30R | 5,301 × 75 ft | Concrete, fair condition | Medium intensity |
| 12R/30L | 7,002 × 150 ft | Asphalt, excellent condition | High intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 05 | Not stated | None listed | None listed | None listed | 2,799 ft |
| 23 | Not stated | None listed | None listed | None listed | 2,799 ft |
| 12L | Not stated | None listed | None listed | None listed | 5,300 ft |
| 30R | Right traffic | None listed | None listed | None listed | 5,300 ft |
| 12R | Right traffic | 4-light PAPI, left | None listed | None listed | 7,002 ft |
| 30L | Not stated | 4-light PAPI, left | ILS | None listed | 7,002 ft |
VHF
Frequencies
- ATIS
- 121.45
- "Downtown". Hours 0630-2200
- CTAF
- 119.925
- UNICOM
- 122.95
- Tower
- 119.925
- "Downtown". Hours 0630-2200
- Ground
- 121.8
- "Downtown". Hours 0630-2200
- Clearance delivery
- 118.275
- "Downtown". Hours 0630-2200
- Clearance delivery
- 121.8
- "Downtown". Sector WHEN TWR CLSD
- Approach / departure
- 123.7
- "Saint Louis"
Weather station
- ASOS CPS
- No frequency listed
Before you go
Brief KCPS in Ascent EFB.
Current weather, NOTAMs and the airport diagram for St Louis Downtown, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.