St. Louis Downtown Airport
CPS · KCPS · Cahokia/St Louis, Illinois · St Clair County · map
St. Louis Downtown Airport is a public-use airport owned by Bi-State Development Agency, 1 mile east of Cahokia/St Louis, Illinois, 413 feet above sea level. It has 3 runways; the longest, 12R/30L, is 7,002 feet of asphalt. It has a control tower and fuel (100LL avgas, Jet A).
Weather right now KCPS · observed 2:53 pm CDT (19:53 UTC), 43 minutes ago
VFR good flying weather
- Wind from the south (170°) at 4 knots
- Visibility 10 miles or more
- Temperature 78°F (26°C), dew point 44°F (7°C)
- Altimeter 30.01 inHg
The forecast issued Tue 12:20 pm CDT (17:20 UTC), good until Wed 1:00 pm CDT (18:00 UTC)
- From Tue 1:00 pm CDT (18:00 UTC): wind from the south at 5 knots, visibility more than 6 miles, clear skies VFR
- From Tue 10:00 pm CDT (03:00 UTC): wind calm, visibility more than 6 miles, clear skies VFR
- From Wed 8:00 am CDT (13:00 UTC): wind from the west-southwest at 6 knots, visibility more than 6 miles, a few clouds at 25,000 feet VFR
The codes as issued (METAR and TAF)
METAR KCPS 061953Z 17004KT 10SM CLR 26/07 A3001 RMK AO2 SLP160 T02560067 $
TAF KCPS 061720Z 0618/0718 17005KT P6SM SKC FM070300 00000KT P6SM SKC FM071300 25006KT P6SM FEW250
From the National Weather Service's aviation weather service, refreshed every few minutes; times are local to the airport with UTC in brackets. For a flight, get your briefing from Flight Service or an approved provider.
The airport
- Codes
- FAA CPS · ICAO KCPS
- Kind
- Airport · open to the public · publicly owned
- Owner
- Bi-State Development Agency
- Elevation
- 413 feet above sea level
- Control tower
- A control tower · 6:30 am to 10:00 pm
- Attended
- around the clock
- Lights
- runway lights see the remarks below; beacon sunset to sunrise
- Fuel
- 100LL avgas, Jet A
- Repairs
- airframe: major repairs; engine: major repairs
- Parking
- hangar, tiedown
- Notes
- certified for airline service (Part 139)
- On the chart
- St Louis sectional
- Magnetic variation
- 0E
- In the FAA's files since
- April 1940
Runways 3
For understanding the field, not for navigation.
| Runway | Length × width | Surface | Lights |
|---|---|---|---|
| 12R/30L | 7,002 × 150 ft | Asphalt, excellent | High-intensity lights |
| 12L/30R | 5,301 × 75 ft | Concrete, fair | Medium-intensity lights |
| 05/23 | 2,799 × 75 ft | Asphalt, fair | Medium-intensity lights |
- Runway 12R: PAPI, four lights on the left, right-hand traffic pattern, tree 30 ft high 809 ft from the end
- Runway 30L: ILS, PAPI, four lights on the left, medium-intensity approach lights with runway alignment lights (MALSR), pole 29 ft high 1,688 ft from the end
- Runway 12L: tree 96 ft high 3,817 ft from the end
- Runway 30R: right-hand traffic pattern, tree 72 ft high 2,664 ft from the end
- Runway 05: tree 54 ft high 811 ft from the end
- Runway 23: tower 72 ft high 1,647 ft from the end
Radio frequencies
| Common traffic advisory (CTAF) · Tower | 119.925 | Downtown |
| UNICOM | 122.95 | |
| ATIS (recorded airport information) | 121.45 | Downtown |
| Clearance delivery | 118.275 | Downtown |
| Ground · Clearance delivery When tower closed | 121.8 | Downtown |
| Approach and departure | 123.7 | Downtown |
| Buudd and star · Farmr and star | 119.15 | Downtown |
| Delma and star · Dixee and star | 128.1 | Downtown |
Automated weather (ASOS), by phone 618-332-0001.
Wind map live wind over the area, from Windy.com
Colours show wind speed, the moving lines its direction; drag the time bar for the coming days. Map and forecast by Windy.com.
Aircraft registered in Cahokia/St Louis from the FAA register
No aircraft on the register list Cahokia/St Louis, IL as the owner's town.
Accidents and incidents at or near this airport NTSB records · 42 since 1982, 2 fatal
Cases the NTSB recorded with this as the nearest airport, newest first. Each opens the full report in plain English.
Nearby within 30 nautical miles
The FAA's remarks as written in the airport file
- Closed to schedule air carrier operations gtr than 9 psgr seats. Unscheduled air carrier operations gtr than 30 psgr seats rqr 12 hour prior permission required.
- Waterfowl on and in the vicinity of airport.
- Activate approach lights (MALSR) runway 30L when the control tower closed; runway end identifier lights runway 30R - the common traffic frequency. High-intensity runway lights runway 12R/30L preset med intst when the control tower closed. Medium-intensity runway lights runway 12L and 30R not available when the control tower closed. PAPI runway 12R and 30L operates continuously.
- 200 with prior permission required.
- Runway 05/23 not available for part 121/PART 380 operations with schedule passenger carrying operations more than 9 passenger seats and unscheduled passenger carrying operations more than 30 passenger seats. No part 121/PART 380 operations except for tax.
- Runway 12L/30R not available for part 121/PART 380 operations with schedule passenger carrying operations more than 9 passenger seats and unscheduled passenger carrying operations more than 30 passenger seats. No part 121/PART 380 operations except for tax.
- West.B.C. gross WT (2S) 160.
- Surface markings faded.
- Surface markings faded.
- Be alert for student training and helicopter operations.
- All taxiways except taxiway B4 prior permission required aircraft over 120000 pounds.
- Surface conditions not mntd 9:00 pm to 7:00 am local.
Facts from the FAA's airport file effective October 1, 2026, written out in plain English; weather from the National Weather Service's aviation weather service; registered aircraft from the FAA register as of October 5, 2026; accidents from the NTSB's public database. Owners are shown only when they are an organisation; no person is named. Check the official sources before a flight: this page is for understanding an airport, not for planning one.