Calculate route from Flat River (Missouri, United States) to O'Fallon (Missouri, United States).
The flight distance (as the crow flies) between Flat River and O'Fallon is 107.9 km.
Roadmap (route) to go from Flat River to O'Fallon detailed above, you can also see the course layout on the map.
While doing trip Flat River - O'Fallon by car, the calculated route ends at a distance , or more straight.
| Country flag | ![]() |
| Location | O'Fallon |
| State | Missouri |
| County | Saint Charles County |
| Country | United States |
| Country code / ISO 2 | US |
| Latitude | 38.8106100 |
| Longitude | -90.6998500 |
| Altitude | 165 meters |
| Time zone | America/Chicago |