St. Louis Regional
ALN · KALN · Alton/St Louis, Illinois · Madison County · map
St. Louis Regional is a public-use airport, 4 miles east of Alton/St Louis, Illinois, 544 feet above sea level. It has 2 runways; the longest, 11/29, is 8,099 feet of asphalt. It has a control tower and fuel (100LL avgas, Jet A).
Weather right now KALN · observed 3:50 pm CDT (20:50 UTC), 30 minutes ago
VFR good flying weather
- Wind from the south-southwest (200°) at 4 knots
- Visibility 10 miles or more
- Temperature 77°F (25°C), dew point 45°F (7°C)
- Altimeter 30.01 inHg
No terminal forecast is issued for this station. The nearest forecast is usually at the closest larger airport.
The codes as issued (METAR and TAF)
METAR KALN 062050Z 20004KT 10SM CLR 25/07 A3001
From the National Weather Service's aviation weather service, refreshed every few minutes; times are local to the airport with UTC in brackets. For a flight, get your briefing from Flight Service or an approved provider.
The airport
- Codes
- FAA ALN · ICAO KALN
- Kind
- Airport · open to the public · publicly owned
- Elevation
- 544 feet above sea level
- Control tower
- A control tower · 7:00 am to 10:00 pm
- Attended
- every day, 7:00 am to 10:00 pm
- Lights
- runway lights see the remarks below; beacon sunset to sunrise
- Fuel
- 100LL avgas, Jet A
- Repairs
- airframe: major repairs; engine: major repairs
- Parking
- hangar, tiedown
- Notes
- certified for airline service (Part 139)
- On the chart
- St Louis sectional
- Magnetic variation
- 1W
- In the FAA's files since
- April 1940
Runways 2
For understanding the field, not for navigation.
| Runway | Length × width | Surface | Lights |
|---|---|---|---|
| 11/29 | 8,099 × 150 ft | Asphalt, good | High-intensity lights |
| 17/35 | 6,500 × 100 ft | Asphalt, good | Medium-intensity lights |
- Runway 11: PAPI, four lights on the right, tree 35 ft high 1,275 ft from the end
- Runway 29: ILS with DME, medium-intensity approach lights with runway alignment lights (MALSR)
- Runway 17: PAPI, four lights on the left, tree 18 ft high 896 ft from the end
- Runway 35: PAPI, four lights on the left, trees 32 ft high 1,379 ft from the end
Radio frequencies
| Common traffic advisory (CTAF) · Tower | 126.0 | Regional |
| UNICOM | 122.95 | |
| ATIS (recorded airport information) · Aln and aWOS-3PT | 128.0 | Regional |
| Ground · Clearance delivery When tower closed | 120.2 | Regional |
| Approach and departure | 124.2 | Regional |
| Farmr and star | 119.15 | Regional |
| Delma and star | 128.1 | Regional |
Automated weather (AWOS-3PT), by phone 618-259-7231.
Wind map live wind over the area, from Windy.com
Colours show wind speed, the moving lines its direction; drag the time bar for the coming days. Map and forecast by Windy.com.
Aircraft registered in Alton/St Louis from the FAA register
No aircraft on the register list Alton/St Louis, IL as the owner's town.
Accidents and incidents at or near this airport NTSB records · 17 since 1982, 1 fatal
Cases the NTSB recorded with this as the nearest airport, newest first. Each opens the full report in plain English.
Nearby within 30 nautical miles
The FAA's remarks as written in the airport file
- Activate approach lights (MALSR) runway 29; runway end identifier lights runway 11 - the common traffic frequency. When the control tower closed PAPI 11, 17, 35; high-intensity runway lights runway 11/29; medium-intensity runway lights runway 17/35 preset on low intst, to incr intst and activate - the common traffic frequency.
- Runway 11 and 17 approach ends closely aligned; verify correct compass hdg prior to departure.
- Index B ffr equip available with 30-MIN prior permission required.
- Migratory bird activity in vicinity of airport september through april.
- Wildlife on and in vicinity of airport
Facts from the FAA's airport file effective October 1, 2026, written out in plain English; weather from the National Weather Service's aviation weather service; registered aircraft from the FAA register as of October 5, 2026; accidents from the NTSB's public database. Owners are shown only when they are an organisation; no person is named. Check the official sources before a flight: this page is for understanding an airport, not for planning one.