Southern Illinois Airport (KMDH)
Medium airport · Murphysboro, Illinois, United States
Airport data
| Name | Southern Illinois Airport |
|---|---|
| ICAO | KMDH |
| IATA | MDH |
| Elevation | 411 ft (125 m) above mean sea level |
| Coordinates | N 37°46'41" W 89°15'7" 37.77810, -89.25200 |
| Location | Murphysboro, Illinois, United States |
| Scheduled service | No |
Runways
| Runway | Length | Width | Surface | Lighted |
|---|---|---|---|---|
| 06/24 | 4,163 ft (1269 m) | 100 ft | ASP | Yes |
| 18L/36R | 6,506 ft (1983 m) | 100 ft | ASP | Yes |
| 18R/36L | 3,498 ft (1066 m) | 60 ft | ASP | Yes |
Southern Illinois Airport at a glance
Southern Illinois Airport is a medium airport in Murphysboro, Illinois, United States, known to airline systems as MDH. The field elevation of 411 ft (125 m) is the number every arriving pilot dials against QNH — circuit heights and initial approach altitudes at KMDH are all figured from it. There is no scheduled airline service listed here — typical traffic is general aviation, training and local operations.
Of its 3 runways, the longest — 18L/36R — offers 6,506 ft (1983 m) of asp surface, with runway lighting for night operations. Runway numbers give magnetic orientation: runway 18L points roughly 180° magnetic.
For the weather side of planning, the live METAR and TAF page for KMDH shows the current observation decoded line by line — wind on an instrument dial, visibility, cloud layers and the resulting flight rules — refreshed continuously from official sources.
Nearest airports to Southern Illinois Airport
Distances are great-circle, measured from the field reference point — planning distances along airways or roads will run longer.
| Airport | Code | Distance |
|---|---|---|
| Veterans Airport of Southern Illinois | KMWA | 21 km (11 NM) |
| Cape Girardeau Regional Airport | KCGI | 68 km (37 NM) |
| Barkley Regional Airport | KPAH | 90 km (49 NM) |
| Scott AFB/Midamerica Airport | KBLV | 99 km (53 NM) |
| St Louis Regional Airport | KALN | 142 km (77 NM) |
Flight-planning notes for Southern Illinois Airport
Density altitude is the quiet performance-killer at any field: on a hot day the 411 ft field elevation of Southern Illinois Airport can translate into a substantially higher density altitude, stretching take-off rolls and flattening climb rates — run the numbers rather than trusting the feel of a standard day. Expect published instrument procedures, controlled airspace and clearance requirements; slots and handling may apply to general aviation traffic.
This entry is one of 917 airports and airfields we list for United States — the country index on the airports hub links the rest. Coordinates above are given in both DMS and decimal degrees so they can go straight into a GPS, a flight planner or a chart plot without conversion.
Where this data comes from
The reference layer behind this page builds on the OurAirports dataset — a public-domain, community-maintained register of the world's airports that many flight planners and apps rely on — with equity records preserved from documented historical listings where the dataset is silent. Figures are carried as published: elevations as surveyed, coordinates as filed, runway dimensions as recorded. Nothing is estimated to fill a gap, and the whole layer regenerates from source on every site build, so corrections upstream arrive here automatically.
Frequently asked questions about Southern Illinois Airport
What is the ICAO code of Southern Illinois Airport?
The ICAO identifier of Southern Illinois Airport is KMDH, and its IATA code is MDH. The ICAO code is the one used in flight plans, METAR reports and aeronautical charts.
How high is Southern Illinois Airport above sea level?
Southern Illinois Airport sits at an elevation of 411 feet (125 metres) above mean sea level. Field elevation is the reference for pattern altitudes and for setting the altimeter on the ground.
Where exactly is Southern Illinois Airport located?
The airport lies at 37.7781, -89.2520 — in Murphysboro, Illinois, United States, in the northern hemisphere. The closest listed field is Veterans Airport of Southern Illinois, about 21 km away.
Does KMDH publish METAR weather reports?
Where the station reports, the current METAR and TAF for KMDH appear on its live weather page on this site, refreshed continuously from the US NWS Aviation Weather Center feed.
How long is the runway at Southern Illinois Airport?
Southern Illinois Airport has 3 runways. The longest, 18L/36R, measures 6,506 ft (1983 m) with a ASP surface.