Alton/St Louis, United States
| IATA Code | ALN |
| ICAO Code | KALN |
| Type | Medium Airport |
| City | Alton/St Louis |
| Country | United States |
| Region | Illinois |
| Continent | North America |
| Latitude | 38.890301 |
| Longitude | -90.045998 |
| Elevation | 165.8 m |
| Time Zone | America/Chicago |
| Local Time | — |