KMDH · Southern Illinois Airport

MURPHYSBORO, ILLINOIS · MEDIUM AIRPORT

411

Elevation ft

Runways

6,506

Longest ft · 18L/36R

37.78N

89.25W

Southern Illinois Airport serves Murphysboro, Illinois at 411 ft elevation with its longest runway, 18L/36R, at 6,506 by 100 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 KMDH in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
18L/36R	6,506 × 100 ft	asphalt	lit
06/24	4,163 × 100 ft	asphalt	lit
18R/36L	3,498 × 60 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 411 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)	411 ft	2,518 ft	2,153 ft	3,230 ft
Warm day (ISA +10)	1,611 ft	2,752 ft	2,280 ft	3,420 ft
Hot day (ISA +20)	2,811 ft	2,986 ft	2,407 ft	3,610 ft
35°C afternoon	2,910 ft	3,006 ft	2,417 ft	3,626 ft

Planning aid only. Even on a 35°C afternoon the longest runway (18L/36R, 6,506 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 KMDH is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KMWA Veterans Airport of Southern Illinois	11 nm E	8,012 ft
KPCD Perryville Regional Airport	29 nm W	6,483 ft
KHSB Harrisburg-Raleigh Airport	33 nm E	5,013 ft
KCGI Cape Girardeau Regional Airport	36 nm SW	6,500 ft
KMVN Mount Vernon Outland Airport	38 nm NE	6,496 ft
KENL Centralia Municipal Airport	45 nm N	5,001 ft

04Jet A prices and FBOs at KMDH

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at KMDH, 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 KMDH or read what a fuel stop actually saves.

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