St Louis Regional Airport (KALN)
Medium airport · Alton/St Louis, Illinois, United States
Airport data
| Name | St Louis Regional Airport |
|---|---|
| ICAO | KALN |
| IATA | ALN |
| Elevation | 544 ft (166 m) above mean sea level |
| Coordinates | N 38°53'25" W 90°2'46" 38.89030, -90.04600 |
| Location | Alton/St Louis, Illinois, United States |
| Scheduled service | No |
Runways
| Runway | Length | Width | Surface | Lighted |
|---|---|---|---|---|
| 11/29 | 8,099 ft (2469 m) | 150 ft | ASP | Yes |
| 17/35 | 6,500 ft (1981 m) | 100 ft | ASP | Yes |
St Louis Regional Airport at a glance
St Louis Regional Airport is a medium airport in Alton/St Louis, Illinois, United States, known to airline systems as ALN. The field elevation of 544 ft (166 m) is the number every arriving pilot dials against QNH — circuit heights and initial approach altitudes at KALN are all figured from it. There is no scheduled airline service listed here — typical traffic is general aviation, training and local operations.
Of its 2 runways, the longest — 11/29 — offers 8,099 ft (2469 m) of asp surface, with runway lighting for night operations. Runway numbers give magnetic orientation: runway 11 points roughly 110° magnetic.
For the weather side of planning, the live METAR and TAF page for KALN 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 St Louis Regional Airport
Distances are great-circle, measured from the field reference point — planning distances along airways or roads will run longer.
| Airport | Code | Distance |
|---|---|---|
| St. Louis Lambert International Airport | KSTL | 32 km (17 NM) |
| Scott AFB/Midamerica Airport | KBLV | 43 km (23 NM) |
| Spirit of St Louis Airport | KSUS | 58 km (31 NM) |
| Abraham Lincoln Capital Airport | KSPI | 111 km (60 NM) |
| Southern Illinois Airport | KMDH | 142 km (77 NM) |
Flight-planning notes for St Louis Regional Airport
Density altitude is the quiet performance-killer at any field: on a hot day the 544 ft field elevation of St Louis Regional 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 St Louis Regional Airport
What is the ICAO code of St Louis Regional Airport?
The ICAO identifier of St Louis Regional Airport is KALN, and its IATA code is ALN. The ICAO code is the one used in flight plans, METAR reports and aeronautical charts.
How high is St Louis Regional Airport above sea level?
St Louis Regional Airport sits at an elevation of 544 feet (166 metres) above mean sea level. Field elevation is the reference for pattern altitudes and for setting the altimeter on the ground.
Where exactly is St Louis Regional Airport located?
The airport lies at 38.8903, -90.0460 — in Alton/St Louis, Illinois, United States, in the northern hemisphere. The closest listed field is St. Louis Lambert International Airport, about 32 km away.
Does KALN publish METAR weather reports?
Where the station reports, the current METAR and TAF for KALN 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 St Louis Regional Airport?
St Louis Regional Airport has 2 runways. The longest, 11/29, measures 8,099 ft (2469 m) with a ASP surface.