St Louis Downtown Airport
CPS · KCPS · Cahokia/St Louis, IL · 413 ft elevation · var 0E · Towered
Airport information
- ICAO / IATA
- KCPS / CPS
- Coordinates
- 38.5707, -90.1562
- Elevation
- 413 ft MSL
- Magnetic variation
- 0E
- Sectional chart
- ST LOUIS
- Airport use
- Public
- Control tower
- Yes
- ARTCC
- KANSAS CITY (ZKC)
- Flight service (FSS)
- SAINT LOUIS
- NOTAM facility
- CPS
- Attendance
- ALL ALL
- Beacon
- white-green (SS-SR)
- Segmented circle
- Yes
- Wind indicator
- lighted
- Activated
- 1940/04
- Distance from city
- 1 E
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-21
| Event | Local (CDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:05 AM | 10:05Z |
| Sunrise | 05:36 AM | 10:36Z |
| Sunset | 08:28 PM | 01:28Z |
| Evening civil twilight Loggable night begins | 09:00 PM | 02:00Z |
Plan a flight from KCPS
Night operations
- Airport lighting
- SEE RMK
- Rotating beacon
- white-green · SS-SR
- Pilot-controlled lighting
- ACTVT MALSR RWY 30L WHEN ATCT CLSD; REIL RWY 30R - CTAF. HIRL RWY 12R/30L PRESET MED INTST WHEN ATCT CLSD. MIRL RWY 12L & 30R NOT AVBL WHEN ATCT CLSD. PAPI RWY 12R & 30L OPR CONSLY. on 119.925 — Chart Supplement ↗
Runway lighting aids — 12R: 4-light PAPI (left) · 30L: 4-light PAPI (left) + MALSR.
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are in the live weather panel above.
Traffic pattern
- Landing
- Rwy 05 · 047°
- Pattern
- left (turns left)
- TPA
- 1,400 ft MSL (≈1,000 AGL)
- CTAF
- 119.925
Enter the left downwind for Rwy 05 at 1,400 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway 05/23
2,799 ft × 75 ft · Asphalt (Fair)- Heading
- 047° mag · 47° true
- Markings
- basic
- Traffic pattern
- Left
- Approach obstacle
- Tree, 54 ft, 811 ft from threshold, 58 ft R of centerline — 11:1 slope to clear · penetrates the 20:1 visual approach surface
- Heading
- 227° mag · 227° true
- Markings
- basic
- Traffic pattern
- Left
- Approach obstacle
- Tower, 72 ft, 1,647 ft from threshold, 16 ft R of centerline — 20:1 slope to clear
Runway 12L/30R
5,301 ft × 75 ft · Concrete (Fair)- Heading
- 122° mag · 122° true
- Markings
- nonprecision
- Traffic pattern
- Left
- Approach obstacle
- Tree, 96 ft, 3,817 ft from threshold, 254 ft L of centerline — 37:1 slope to clear
- Heading
- 302° mag · 302° true
- Markings
- nonprecision
- Traffic pattern
- Right
- Approach obstacle
- Tree, 72 ft, 2,664 ft from threshold, 306 ft R of centerline — 34:1 slope to clear
Runway 12R/30L
7,002 ft × 150 ft · Asphalt (Excellent)- Heading
- 122° mag · 122° true
- Markings
- precision
- VGSI
- 4-light PAPI (left) (3°)
- Traffic pattern
- Right
- Approach obstacle
- Tree, 30 ft, 809 ft from threshold, 487 ft L of centerline — 20:1 slope to clear
- Heading
- 302° mag · 302° true
- Markings
- precision
- VGSI
- 4-light PAPI (left) (3°)
- Approach lights
- MALSR
- Instrument landing
- ILS · CAT I · LOC 109.1 (CPS) · GS 3.00°
- Traffic pattern
- Left
- Approach obstacle
- Pole, 29 ft, 1,688 ft from threshold, 362 ft L of centerline — 36:1 slope to clear
| Runway | Length | Your margin |
|---|---|---|
| 05/23 | 2,799 ft | |
| 12L/30R | 5,301 ft | |
| 12R/30L | 7,002 ft |
Communication frequencies
| Service | Frequency | Notes |
|---|---|---|
| A/D | 123.7 | APP/DEP |
| ATIS | 121.45 | |
| CLD | 121.8 | CLNC DEL |
| CTAF | 119.925 | |
| GND | 121.8 | |
| TWR | 119.925 | DOWNTOWN TWR |
| UNIC | 122.95 | UNICOM |
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| SKE · Scott | TACAN | 112.20 | r274° / 14.4 NM |
| CSX · Cardinal | VOR-DME | 116.45 | r139° / 14.5 NM |
| TOY · Troy | VORTAC | 116.00 | r224° / 15 NM |
| STL · St Louis | VORTAC | 117.40 | r138° / 23.2 NM |
| FTZ · Foristell | VORTAC | 110.80 | r096° / 38.9 NM |
Airport diagram
Open PDF ↗Preview diagram
Procedures at a glance
Departures
Minimums & Hot Spots
Chart Supplement FAA A/FD
Open PDF ↗Preview Chart Supplement
VFR sectional
Services
- Fuel available
- 100LL, Jet A
- Bulk oxygen
- HIGH
- Airframe service
- MAJOR
- Powerplant service
- MAJOR
- Parking
- tiedowns, hangars
- Other services
- Charter, Instruction, Rental, Aircraft sales
Ownership & management
Remarks FAA
- CLSD TO SKED ACR OPS GTR THAN 9 PSGR SEATS. UNSKED ACR OPS GTR THAN 30 PSGR SEATS RQR 12 HR PPR.
- WATERFOWL ON & INVOF ARPT.
- BE ALERT FOR STUDENT TRNG & HEL OPS.
- ALL TWYS EXCP TWY B4 PPR ACFT OVER 120000 LBS.
- SFC CONDS NOT MNTD 2100-0700 LCL.
- ACTVT MALSR RWY 30L WHEN ATCT CLSD; REIL RWY 30R - CTAF. HIRL RWY 12R/30L PRESET MED INTST WHEN ATCT CLSD. MIRL RWY 12L & 30R NOT AVBL WHEN ATCT CLSD. PAPI RWY 12R & 30L OPR CONSLY.
- 200 WITH PPR.
- PCR VALUE: 400/F/D/X/T
- RWY 05/23 NOT AVBL FOR PART 121/PART 380 OPS WITH SKED PAX CARRYING OPS MORE THAN 9 PAX SEATS AND NON-SKED PAX CARRYING OPS MORE THAN 30 PAX SEATS. NO PART 121/PART 380 OPS EXC FOR TAX.
- RWY 12L/30R NOT AVBL FOR PART 121/PART 380 OPS WITH SKED PAX CARRYING OPS MORE THAN 9 PAX SEATS AND NON-SKED PAX CARRYING OPS MORE THAN 30 PAX SEATS. NO PART 121/PART 380 OPS EXC FOR TAX.
- W.B.C. GROSS WT (2S) 160.
- SFC MARKINGS FADED.
- SFC MARKINGS FADED.
Nearby airports
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open KCPS in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.
About KCPS
St Louis Downtown Airport (CPS · KCPS) is an airport in Cahokia/St Louis, IL, at 413 ft MSL. It has 3 runways, the longest 7,002 ft, with a control tower. This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for KCPS, refreshed from the Aviation Weather Center and FAA NASR.
Does KCPS have a control tower?
Yes. St Louis Downtown Airport has an operating FAA control tower. Check the Comms & NavAids tab for tower and ground frequencies.
What is the longest runway at KCPS?
St Louis Downtown Airport has 3 runways; the longest is 7,002 ft. See the Runways tab for headings, surface, and lighting.
Where is KCPS?
St Louis Downtown Airport is in Cahokia/St Louis, IL, at an elevation of 413 ft MSL. Coordinates: 38.5707, -90.1562.
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