How far is Imperial, MO from O'Fallon, MO?
Distance by Flight
Shortest distance between Imperial and O'Fallon is 35.06 miles (56.42 km).
Flight distance from Imperial, MO to O'Fallon, MO is 35.06 miles. Estimated flight time is 00 hours 05 minutes.
Driving distance
The driving distance from Imperial, Missouri to O'Fallon, Missouri is: 46.03 miles (74.08 km) by car.
Driving from Imperial to O'Fallon will take approximately 00 hours 47 minutes.
#1 Imperial
| Population | |
|---|---|
| GPS Coordinates | 38°22'11"N 90°22'42"W |
| Latitude | 38.3697800 |
| Longitude | -90.3784500 |
| Altitude | 135 |
| Country | United States |
#2 O'Fallon
The most populous city in St. Charles County, Missouri. It is located in the eastern part of the county. O'Fallon is known for its many parks and green spaces, its many historical sites, and its many attractions, such as the O'Fallon City Hall and the O'Fallon History Museum.
| Population | 89769 |
|---|---|
| GPS Coordinates | 38°48'38"N 90°41'59"W |
| Latitude | 38.8106100 |
| Longitude | -90.6998500 |
| Altitude | 165 |
| Country | United States |
Ending point in O'Fallon: (-90.699849,38.810674)
Estimated Travel Time Between Imperial and O'Fallon
The distance between Imperial and O'Fallon is 74 km if you choose to drive by road. You can go 00 hours 49 minutes if you drive your car at an average speed of 90 kilometers / hour. For different choices, please review the avg. speed travel time table on the below.
There is no time difference between Imperial and O'Fallon. The current time is 00:52:40.
| Average Speed | Travel Time |
|---|---|
| 30 mph (48.3 km/h) | 01 hours 32 minutes |
| 40 mph (64.37 km/h) | 01 hours 09 minutes |
| 50 mph (80.47 km/h) | 00 hours 55 minutes |
| 60 mph (96.56 km/h) | 00 hours 46 minutes |
| 70 mph (112.65 km/h) | 00 hours 39 minutes |
| 75 mph (120.7 km/h) | 00 hours 36 minutes |
| 80 mph (128.75 km/h) | 00 hours 34 minutes |
Gas Consumption
A car with a fuel efficiency of 8.3 l/100 km will need 6.15 liters (1.62 gallon) of gas to cover the route between Imperial and O'Fallon.
The estimated cost of gas to go from Imperial to O'Fallon is $5.21 (diesel $7.19).
Missouri gas prices.
| Gasoline | Mid Grade | Premium | Diesel | |
|---|---|---|---|---|
| Gallon | $3.21 | $3.54 | $3.86 | $4.43 |
| Total | $5.21 | $5.74 | $6.27 | $7.19 |
Take a look at our Gas Cost Calculator feature. It will figure out how much it will cost to drive this particular distance.
The average gas price (in Missouri ) per gallon of daily gas for calculations is $3.205 (Diesel $4.426) /gallon. Last changed prices on December 28, 2025.
How did we calculate the distance?
The place names are translated into coordinates to approximate the distance between Imperial and O'Fallon (latitude and longitude). Cities, states, and countries each have their own regional center. The Haversine formula is used to measure the radius.
Distance to Other Cities
Driving distance from Castle Point, MO to Imperial 34.91 miles (56 km)
Driving distance from East Independence, MO to Imperial 248.54 miles (400 km)
