ALN
Alton/St Louis, IL
St Louis Regional Airport
Medium airport
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FIELD ELEVATION
544 ft
LONGEST RUNWAY
8,099 ft
RUNWAYS
2
SURFACE
Asphalt
CTAF / UNICOM
126
TOWER
126
LATITUDE
38°53'25.1"N
LONGITUDE
90°02'45.6"W
ICAO
KALN
RUNWAYS
RWY
LENGTH
WIDTH
SURFACE
LIGHTS
11/29
8,099 ft
150 ft
Asphalt
Lighted
17/35
6,500 ft
100 ft
Asphalt
Lighted
RADIO
CTAF
CTAF
126
UNIC
UNICOM
122.95
TWR
REGIONAL TWR
126
GND
GND
120.2
ATIS
ATIS
128
AWOS
AWOS 3
128
CLD
CLNC DEL
120.2
RDO
RDO
122.05
A/D
APP/DEP
124.2
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Where this data comes from
OurAirports open data (public domain), derived from FAA NASR. Retrieved 26 August 2026. Airport diagrams, where shown, are FAA charts, cycle 2608, effective 6 August 2026 to 3 September 2026. Where the FAA publishes none, the runway layout is drawn to scale from published threshold coordinates — a schematic, not a survey. Not for navigation. Check the Chart Supplement and NOTAMs before you fly.