St Louis Downtown Airport
Daylight today(Jul 17, 2026, local time)
About 14h 34m of daylight. Civil twilight (dawn/dusk) approximates the FAA definition of night for logging and currency. Times are computed and approximate — verify with official sources.
About St Louis Downtown Airport
St. Louis Downtown Airport is a public-use airport located in Greater St. Louis, one mile (2 km) east of the central business district of Cahokia Heights, in St. Clair County, Illinois, United States. It is owned by the Bi-State Development Agency. The airport is located less than 3 miles from the Gateway Arch riverfront in St. Louis and is used by many business aircraft visiting the St. Louis region. Airport services include one full-service 24-hour fixed-base operator, an instrument landing system, an FAA air traffic control tower, and its own dedicated Index B aircraft rescue and firefighting (ARFF) service. It is utilized mainly by Saint Louis University's Parks College of Engineering, Aviation and Technology for training purposes, as well as the St. Louis Cardinals for charter flights to away games.
Summary from Wikipedia, photo via Wikimedia Commons, licensed under CC BY-SA.
Live weather
KCPSLive departures & arrivals
Flight data by AeroDataBox. Times are estimates — not for navigation; confirm with the airline.
Where you can fly from here
Current scheduled routes & daily frequency by AeroDataBox. Approximate — confirm bookable schedules with the airline.
Map
Runway centrelines, navaids and overlapping airspace. Tiles © OpenStreetMap contributors. Reference only — not for navigation.
Runways (3)
| Runway | Length | Width | Surface | Lighting | Status |
|---|---|---|---|---|---|
| 12R / 30L | 7,002 ft / 2,134 m | 150 ft | Asp | Lighted | Open |
| 12L / 30R | 5,301 ft / 1,616 m | 75 ft | Con | Lighted | Open |
| 05 / 23 | 2,799 ft / 853 m | 75 ft | Asph-f | Unlit | Open |
Radio frequencies (7)
| Type | Description | Frequency |
|---|---|---|
| A/D | APP/DEP | 123.700 MHz |
| ATIS | ATIS | 121.450 MHz |
| CLD | CLNC DEL | 121.800 MHz |
| CTAF | CTAF | 119.925 MHz |
| GND | GND | 121.800 MHz |
| TWR | DOWNTOWN TWR | 119.925 MHz |
| UNIC | UNICOM | 122.950 MHz |
Instrument procedures & charts
Airport diagram (1)
Instrument approaches (4)
Departure procedures (SIDs) (7)
Arrivals (STARs) (4)
Takeoff & alternate minimums (2)
Charts published by the FAA (public domain) and updated each 28-day cycle. Always fly the current, official chart. Full charts page.
Airspace in this area(4)
| Name | Class | Type | Floor | Ceiling |
|---|---|---|---|---|
| ST LOUIS CLASS B AREA E EXCLUDES AREA A,B,C AND D | Class B | Controlled | 3000 ft MSL | 8000 ft MSL |
| ST LOUIS CLASS B AREA G | Class B | Controlled | 3500 ft MSL | 8000 ft MSL |
| ST LOUIS CLASS B AREA H | Class B | Controlled | 4500 ft MSL | 8000 ft MSL |
| CAHOKIA CLASS D | Class D | Controlled | GND | 2900 ft MSL |
Approximate bounding-box match from OpenAIP · all United States airspace. Reference only — consult official charts for exact boundaries and status.
Tall obstacles nearby
| Obstacle | Height AGL | Top (MSL) | Lit |
|---|---|---|---|
| Gateway Arch | 630 ft | 430 ft | — |
| Obstacle | 594 ft | 538 ft | — |
| Obstacle | 587 ft | 466 ft | — |
| Buenger Hall - Dorm D | 577 ft | 587 ft | — |
| Obstacle | 558 ft | 459 ft | — |
| Obstacle | 436 ft | 390 ft | — |
| Obstacle | 436 ft | 390 ft | — |
| Obstacle | 400 ft | 505 ft | — |
Tallest obstacles within ~10 nm. Data via OpenAIP. Reference only — consult official charts.
Nearby airports
Great-circle distance and true bearing from St Louis Downtown Airport.
Frequently asked questions
What is the ICAO code for St Louis Downtown Airport?
The ICAO code for St Louis Downtown Airport is KCPS, and its IATA code is CPS.
Where is St Louis Downtown Airport located?
St Louis Downtown Airport is small airport located in Cahokia/St Louis, United States, at an elevation of 413 ft (126 m).
How many runways does St Louis Downtown Airport have?
St Louis Downtown Airport has 3 runways, the longest being 7,002 ft / 2,134 m.
What time zone is St Louis Downtown Airport in?
St Louis Downtown Airport is in the America/Chicago time zone (UTC-05:00).
What is the magnetic variation at St Louis Downtown Airport?
The magnetic variation (declination) at St Louis Downtown Airport is approximately 2° W, per the World Magnetic Model. Variation changes slowly over time — always use the current value charted for navigation.
What airports are near St Louis Downtown Airport?
The nearest airport to St Louis Downtown Airport is Aero Estates Airport (7IS2), about 5.4 nm to the ese, followed by King Airport and Ben Emge Airport.
Is the information on this page suitable for flight planning?
No. St Louis Downtown Airport data here is for reference and training only — not for navigation. Always consult official sources and current charts before any flight.