KCPS · St Louis Downtown Airport

CAHOKIA/ST LOUIS, ILLINOIS · SMALL AIRPORT

413

Elevation ft

Runways

7,002

Longest ft · 12R/30L

38.57N

90.16W

St Louis Downtown Airport serves Cahokia/St Louis, Illinois at 413 ft elevation with its longest runway, 12R/30L, at 7,002 by 150 ft. The figures below are computed from FAA NASR runway data (via OurAirports) and the same rules of thumb JetDesk uses on the airport page in the app; the POH and current NOTAMs are the authority.

Open KCPS in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
12R/30L	7,002 × 150 ft	asphalt	lit
12L/30R	5,301 × 75 ft	concrete	lit
05/23	2,799 × 75 ft	asphalt (fair)	unlit

02Density altitude and turboprop runway margins

Standard temperature at 413 ft is about 14°C. Every 1,000 ft of density altitude adds roughly 8 percent to a turboprop's takeoff distance and 5 percent to its landing distance. The table uses Piper Meridian book numbers (2,438 ft takeoff and 2,110 ft landing over a 50 ft obstacle at sea level, ISA, max weight) as a reference airplane; heavier turboprops and light jets scale the same way from their own POH figures.

Conditions	Density altitude	Takeoff est.	Landing est.	Landing × 1.5
Standard day (ISA, 14°C)	413 ft	2,519 ft	2,154 ft	3,230 ft
Warm day (ISA +10)	1,613 ft	2,753 ft	2,280 ft	3,420 ft
Hot day (ISA +20)	2,813 ft	2,987 ft	2,407 ft	3,610 ft
35°C afternoon	2,912 ft	3,006 ft	2,417 ft	3,626 ft

Planning aid only. Even on a 35°C afternoon the longest runway (12R/30L, 7,002 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,626 ft needed). The percentages are a generic rule of thumb applied to one reference airplane, not certified performance data for any specific aircraft, and the runway size categories describe the runway, not your airplane's suitability. Verify with the approved flight manual before every flight.

03Nearby fields with 5,000 ft or more

Useful as alternates, as fuel stops when the price at KCPS is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KSTL St. Louis Lambert International Airport	15 nm NW	11,020 ft
KALN St Louis Regional Airport	20 nm N	8,099 ft
KSUS Spirit of St Louis Airport	24 nm W	7,486 ft
KFYG Washington Regional Airport	39 nm W	5,002 ft
KPCD Perryville Regional Airport	44 nm S	6,483 ft

04Jet A prices and FBOs at KCPS

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at KCPS, the app flags a price stale after two weeks, and the route finder ranks every field within a corridor of your route by net savings after the cost of the extra cycle. Log a price at KCPS or read what a fuel stop actually saves.

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