How far is Campbell, MO from O'Fallon, MO?
The driving distance from Campbell, MO to O'Fallon, MO is about 203.4 miles (327.3 km), with a travel time of about 03h 23m by car.
- The straight-line flight distance is about 163.7 miles (263.5 km).
- For a round trip, plan for roughly 06h 46m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 03h 23m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Rain Showers then Sunny
Driving Route Map
The map below follows the saved road route between Campbell and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Campbell and O'Fallon.
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1
Start on Grand Avenue
807 ft · 15 sec · Grand Avenue
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2
Turn right onto Frisco Street
2977 ft · 1 min · Frisco Street
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3
At the end of the road, turn left
26.5 mi · 39 min
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4
Turn right onto South Westwood Boulevard
2.4 mi · 4 min · South Westwood Boulevard
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5
Continue on State Street
1396 ft · 26 sec · State Street
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6
Continue on North Westwood Boulevard
1.6 mi · 2 min · North Westwood Boulevard
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7
Continue straight
2283 ft · 38 sec
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8
Continue straight
112.6 mi · 2 hr 9 min
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9
Keep slight right
1750 ft · 27 sec
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10
Take the exit straight toward I 55 North: Saint Louis
1735 ft · 49 sec
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11
Merge slight left
20.5 mi · 22 min
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12
Continue on Rosa Parks Highway
1.3 mi · 2 min · Rosa Parks Highway
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13
Take the exit slight right toward I 270 West, I 255 East: Kansas City, Chicago
1279 ft · 27 sec
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14
Keep slight left to continue on I 270 West: Kansas City
118 m · 8 sec
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15
Continue on I 270 West
1.2 km · 1 min
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16
Merge slight left
18.1 mi · 23 min
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17
Take the exit slight right toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
1 mi · 1 min
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18
Keep slight left to continue on I 70 West: Kansas City
645 ft · 11 sec
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19
Continue on I 70 West: Kansas City
1 km · 57 sec
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20
Merge slight left
13.6 mi · 17 min
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21
Take the exit slight right toward MO K: O'Fallon, Main Street
119 m · 8 sec
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22
Turn straight onto East Terra Lane
1.4 km · 2 min · East Terra Lane
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23
Turn right onto South Main Street
2830 ft · 1 min · South Main Street
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24
Turn right
8 m · 2 sec
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25
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Campbell and O'Fallon.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
North Westwood Boulevard
Continue straight
113 mi · 02h 09m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Slight Chance Rain Showers then Sunny leaving Campbell and Sunny near O'Fallon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Campbell to O'Fallon?
The road trip is about 203.4 miles (327.3 km) and usually takes 03h 23m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Farmington is a useful midpoint, sitting about 101.6 miles from Campbell and 101.8 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 163.7 miles (263.5 km), while the road route adds roughly 39.7 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 10:14 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $27.08 one way or $54.15 round trip. Estimated CO2 is about 63.8 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Rain Showers then Sunny around Campbell and Sunny near O'Fallon.
Stop Ideas Near Farmington
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Farmington.
Kirkwood
Gateway Transportation Center
Washington
Carbondale station
Flight Path Map
This map shows the direct air route between Campbell and O'Fallon. Straight-line distance: 163.71 mi (263.47 km).
#1 Campbell
City in Dunklin County, Missouri, United States
| Population | 1,792 |
| Coordinates | 36.4933900, -90.0750900 |
| Altitude | 96 |
| Country | United States |
#2 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
End: (-90.699849, 38.810674)
Estimated Travel Time
Distance: 327 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 46m |
| 40 mph (64.37 km/h) | 05h 05m |
| 50 mph (80.47 km/h) | 04h 04m |
| 60 mph (96.56 km/h) | 03h 23m |
| 70 mph (112.65 km/h) | 02h 54m |
| 80 mph (129 km/h) | 02h 32m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $27.08 | $54.15 |
| Mid-grade | $4.25 | $30.54 | $61.07 |
| Premium | $4.65 | $33.42 | $66.83 |
| Diesel | $5.30 | $38.08 | $76.17 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Missouri · Apr 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.