St Louis Downtown Airport
CPS · KCPS · Cahokia/St Louis, IL · Towered · Print kneeboard
FAA airport diagramView full size ↓ Nearby now
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Weather
METAR observed
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TAF forecast
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Sun & FAA night2026-08-04 · night begins 08:37 PM
| Event | Local (CDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:35 AM | 10:35Z |
| Sunrise | 06:05 AM | 11:05Z |
| Sunset | 08:08 PM | 01:08Z |
| Evening civil twilight Loggable night begins | 08:37 PM | 01:37Z |
Plan a flight from KCPS
Past 24 hours category · wind · ceiling · visibility trends
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Density altitude today projected curve · departure window · takeoff roll
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Advisories
NOTAMs
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Pilot reports
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Airspace hazards
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Runways
RWY 23LEFT traffic
- Heading
- 227° mag · 227° true
- Dimensions
- 2,799 × 75 ft
- TPA
- 1,400 ft MSL (≈1,000 AGL) · standard
- Surface
- Asphalt
- CTAF
- 119.925
More details — RWY 23
- Threshold elev
- 409 ft
- Markings
- basic
- Approach obstacle
- Tower, 72 ft, 1,647 ft from threshold, 16 ft R of centerline — 20:1 slope to clear
- TDZ elevation
- 413 ft
- Declared TORA/TODA/ASDA/LDA
- 2,799 / 2,799 / 2,799 / 2,799 ft
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates
| Runway | Length | Your margin |
|---|---|---|
| 05/23 | 2,799 ft | |
| 12L/30R | 5,301 ft | |
| 12R/30L | 7,002 ft |
Prefer one flat page? Full runway details for KCPS → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the KCPS kneeboard →
Comms & NavAids
Communication frequencies
Before taxi
“Downtown”Taxi & takeoff
“Downtown”Departure & arrival
“Saint Louis”Also
ATC assigns the exact frequency (in your clearance or on handoff) — which one depends on your SID (departing) or STAR (arriving).
By procedure & sector (6 frequencies)
| Frequency | Used by |
|---|---|
| 119.15 | BUUDD STAR · FARMR STAR |
| 128.1 | DELMA STAR · DIXEE STAR |
| 307.05 | DELMA STAR · DIXEE STAR |
| 335.5 | BUUDD STAR · FARMR STAR |
| 371.875 | APCH/P DEP/P |
| 379.3 | LCL/P |
Source: FAA NASR (current 28-day cycle).
Instrument landing systems
RWY 30L
| Runway | ILS |
|---|---|
| RWY 30L | ILS · CAT I · LOC 109.1 (CPS) · GS 3.00° |
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
SKE 112.20 · TOY 116.00 · STL 117.40 · +1
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| SKE · Scott | TACAN | 112.20 · 59X | — | r278° / 14.4 NM |
| TOY · Troy | VORTAC | 116.00 · 107X | Low | r224° / 15 NM |
| STL · St Louis | VORTAC | 117.40 · 121X | High | r138° / 23.2 NM |
| FTZ · Foristell | VORTAC | 114.35 · 90Y | Low | r096° / 38.9 NM |
Prefer one flat list? All KCPS frequencies →
Charts & procedures
Lowest minimums here: ILS with vertical guidance · VFR sectional →
Airport info
From the field
Do you run KCPS, or an FBO, flight school, or shop on it? Claim your listing to keep fuel, fees, hours, and services current.
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
- Tower hours
- 0630-2200
- Airspace
- Class D · CLASS D SVC 0630-2200; OTHER TIMES CLASS G
- Weather station
- ASOS · 121.45 · ☎ 618-332-0001
- ARTCC
- KANSAS CITY (ZKC)
- Flight service (FSS)
- SAINT LOUIS · 1-800-WX-BRIEF
- NOTAM facility
- CPS
- Attendance
- ALL ALL
- Beacon
- white-green (SS-SR)
- Segmented circle
- Yes
- Wind indicator
- lighted
- FAR 139 class
- IV A
- Activated
- 1940/04
- Distance from city
- 1 E
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 under Sun & FAA night in the Weather section.
Services fuel · repairs · oxygen · attendance
- 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 2 contacts
Remarks FAA · 12 notes
General
- 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.
Runways
- 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.
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.
Embed KCPS weather on your site free widget for schools, clubs & FBOs
Live METAR, flight category, and favored runway for KCPS — paste this into your website's HTML. It updates automatically and stays free.
More widgets — crosswind, E6B, density altitude — on the embed page.
Nearby airports
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Also nearby: 7IS2 Aero Estates Airport (private) (5 NM) · 7IS9 King Airport (7 NM) · 2IL7 Ben Emge Airport (private) (7 NM) · H49 Sackman Field (8 NM) · 1IL4 Flight Park Inc Airport (private) (9 NM) · 27LL Ralph Jacobs Airport (private) (14 NM)
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. See the Comms & NavAids section 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 section 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.
Fly out of KCPS often?
Save KCPS as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.
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.