Distance from Saint Louis, MO to O Fallon, IL is 18Miles or 29 Km. You can get this distance about 24 mins. If you want to planning travel with plane for 16 Miles or 26 Km, You can get this distance about 32 mins .
A car with an average MPG will needs 0.83 gallons of gas to get the route between these points.
The estimated cost of gas to get between Saint Louis, MO and O Fallon, IL is $1.88.
During the route, an average car will release 16.26 pounds of CO2 to the atmosphere. Your carbon footprint is 0.9 pounds of CO2 per mile.
* Average US MPG used for calculations is 21.6 MPG.
* Average US gas price used for calculation is 2.27 per gallon.