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Alton/St Louis, Illinois

KALN St Louis Rgnl

St Louis Rgnl (KALN) is a towered, public-use airport in Alton/St Louis, Illinois, at 543.5 ft MSL. It has 2 runways: 11/29 (8,099 by 150 ft, asphalt), 17/35 (6,500 by 100 ft, asphalt). CTAF 126.0.

FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.

Airport

At a glance

Identifiers
ICAO KALN, FAA ALN
Location
Alton/St Louis, Illinois (Madison County). 4 NM E of the city center
Elevation
543.5 ft MSL
Position
38.8899° N, 90.0460° W
Control tower
Yes (ATCT)
Sectional chart
St Louis
Magnetic variation
1° W (2010)
Fuel
100LL, Jet A
Ownership
Publicly owned, open to the public

2 runways

Runways

RunwayLength × widthSurfaceEdge lights
11/298,099 × 150 ftAsphalt, good conditionHigh intensity
17/356,500 × 100 ftAsphalt, good conditionMedium intensity

Runway ends and traffic pattern

EndPatternGlide slope lightsInstrumentDisplaced thresholdLanding distance
11Left traffic4-light PAPI, rightNone listedNone listed8,099 ft
29Left trafficNone listedILS/DMENone listed8,099 ft
17Left traffic4-light PAPI, leftNone listedNone listedNot listed
35Left traffic4-light PAPI, leftNone listedNone listedNot listed

VHF

Frequencies

ATIS
128.0
"Regional". Hours 0700-2200
CTAF
126.0
UNICOM
122.95
Tower
126.0
"Regional". Hours 0700-2200
Ground
120.2
"Regional". Hours 0700-2200
Clearance delivery
120.2
"Regional". Sector WHEN TWR CLSD
Approach / departure
124.2
"Saint Louis"

Weather station

AWOS-3PT ALN
128.0

Within reach

Nearest public airports

Before you go

Brief KALN in Ascent EFB.

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Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.

Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.