# St Louis Downtown Airport (CPS / KCPS)

**St Louis Downtown Airport** (IATA: CPS, ICAO: KCPS) is a small airport in Cahokia/St Louis, Illinois, United States. It opened in Apr 1940. It has 3 runways; the longest is 7,002 ft (2,134 m). In 2025 it handled 12 thousand passengers.

Web page: https://dromopedia.com/airports/kcps

## At a glance

- IATA / ICAO: CPS / KCPS
- FAA: CPS
- Type: Small airport
- Owner: Bi-State Development Agency
- Serves: Cahokia/St Louis, Illinois, United States
- Opened: Apr 1940
- Elevation: 413 ft / 126 m
- Coordinates: 38.5707, -90.1562
- Runways: 3
- Longest runway: 7,002 ft / 2,134 m
- Instrument procedures: 4 approaches, 4 departures, 4 arrivals
- Passengers: 11,734 (2025)
- Time zone: UTC-6/-5 · America/Chicago
- Website: http://stlouisdowntownairport.com/
- Wikipedia: https://en.wikipedia.org/wiki/St._Louis_Downtown_Airport (7 languages)
- Wikidata: https://www.wikidata.org/wiki/Q7589613
- Weather station: KCPS
- Ident: KCPS

## Timeline

- Apr 1940: St Louis Downtown Airport opens.

## Runways

| Ident | Length | Width | Surface | True headings | Lighted |
| --- | --- | --- | --- | --- | --- |
| 12R/30L | 7,002 ft / 2,134 m | 150 ft / 46 m | Asphalt | 122° / 302° | yes |
| 12L/30R | 5,301 ft / 1,616 m | 75 ft / 23 m | Concrete | 122° / 302° | yes |
| 05/23 | 2,799 ft / 853 m | 75 ft / 23 m | Asphalt | 047° / 227° | yes |

- FAA airport diagram: https://aeronav.faa.gov/d-tpp/2611/05316AD.PDF

## Passengers per year

| Year | Passengers | Source |
| --- | --- | --- |
| 2016 | 7,147 | BTS T-100 Segment |
| 2017 | 8,176 | BTS T-100 Segment |
| 2018 | 5,671 | BTS T-100 Segment |
| 2019 | 7,398 | BTS T-100 Segment |
| 2021 | 6,396 | BTS T-100 Segment |
| 2022 | 9,087 | BTS T-100 Segment |
| 2023 | 8,094 | BTS T-100 Segment |
| 2024 | 11,309 | BTS T-100 Segment |
| 2025 | 11,734 | BTS T-100 Segment |

## Rankings

Ranked among 48,075 open airports; = marks a shared place.

| Measure | Value | World | Region | Country |
| --- | --- | --- | --- | --- |
| Passengers | 12K (2025) | #2,626 of 3,974 | #634 in North America | #439 in US |
| Longest runway | 7,002 ft / 2,134 m | =3,467 of 29,858 | =814 in North America | =615 in US |
| Elevation | 413 ft / 126 m | =28,776 of 43,403 | =13,589 in North America | =11,414 in US |
| Age | Opened 1940 | =1,114 of 15,079 | =366 in North America | =338 in US |
| Runways | 3 | =151 of 29,978 | =83 in North America | =81 in US |

## Radio frequencies

| Type | Description | MHz |
| --- | --- | --- |
| A/D | APP/DEP | 123.700 |
| ATIS | ATIS | 121.450 |
| CLD | CLNC DEL | 121.800 |
| CTAF | CTAF | 119.925 |
| GND | GND | 121.800 |
| TWR | DOWNTOWN TWR | 119.925 |
| UNIC | UNICOM | 122.950 |

## Nearby airports

- [7IS2](https://dromopedia.com/airports/7is2.md) Aero Estates Airport · 6.2 mi / 10 km
- [7IS9](https://dromopedia.com/airports/7is9.md) King Airport · 7.8 mi / 13 km
- [2IL7](https://dromopedia.com/airports/2il7.md) Ben Emge Airport · 7.9 mi / 13 km
- [H49](https://dromopedia.com/airports/h49.md) Sackman Field · 9.4 mi / 15 km
- [1IL4](https://dromopedia.com/airports/1il4.md) Flight Park Inc Airport · 11 mi / 17 km
- [27LL](https://dromopedia.com/airports/27ll.md) Ralph Jacobs Airport · 16 mi / 26 km

## Sources

- [BTS T-100 Segment](https://www.transtats.bts.gov/Tables.asp?QO_VQ=EEE&QO_anzr=Nv4%20Pn44vr45): US traffic: Bureau of Transportation Statistics, T-100 Segment (Public Domain (US Government))
- [FAA NASR](https://www.faa.gov/air_traffic/flight_info/aeronav/aero_data/NASR_Subscription/): US airport data: FAA National Airspace System Resources (Public Domain (US Government))
- [NOAA Aviation Weather Center](https://aviationweather.gov/data/api/): Weather data: NOAA Aviation Weather Center (Public Domain (US Government))
- [OurAirports](https://ourairports.com/data/): Airport data from OurAirports (Public Domain)
- [Wikidata](https://www.wikidata.org): Structured data from Wikidata (CC0 1.0)
- [timezone-boundary-builder](https://github.com/evansiroky/timezone-boundary-builder): Time zone boundaries © OpenStreetMap contributors, timezone-boundary-builder (ODbL 1.0)
- Every figure with its source: https://dromopedia.com/airports/kcps/data