How far is O'Fallon, MO from Smithville, MO?
The driving distance from O'Fallon, MO to Smithville, MO is about 237.1 miles (381.5 km), with a travel time of about 04h 32m by car.
- The straight-line flight distance is about 211.9 miles (341 km).
- For a round trip, plan for roughly 09h 04m 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 04h 32m.
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 Cooper County, Missouri, USA
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between O'Fallon and Smithville.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Smithville.
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1
Start on the route
8 m · 7 sec
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2
Turn left onto South Main Street
3116 ft · 2 min · South Main Street
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3
Turn left onto I 70 East
10 m · 6 sec
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4
Turn sharp left onto South Main Street
87 m · 11 sec · South Main Street
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5
Turn left onto West Terra Lane
576 ft · 12 sec · West Terra Lane
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6
Take the ramp straight toward I 70 West
146 m · 7 sec
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7
Merge slight left
200.7 mi · 3 hr 46 min
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8
Continue on Truman/Eisenhower Presidential Highway
2.7 mi · 3 min · Truman/Eisenhower Presidential Highway
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9
Continue on Clifton J. Scott Memorial Highway
1.8 mi · 2 min · Clifton J. Scott Memorial Highway
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10
Continue on Truman/Eisenhower Presidential Highway
2.9 mi · 3 min · Truman/Eisenhower Presidential Highway
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11
Continue on George Brett Super Highway
1.4 km · 58 sec · George Brett Super Highway
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12
Take the exit slight right toward I 435 North, US 24 East: Des Moines
1.1 mi · 2 min
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13
Merge slight left onto Lamar Hunt Memorial Highway
7.8 mi · 9 min · Lamar Hunt Memorial Highway
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14
Continue on I435 N
1.3 mi · 1 min · I435 N
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15
Continue straight
11.3 mi · 12 min
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16
Take the exit slight right toward US 169 North: Smithville
3082 ft · 1 min
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17
Merge slight left
5 mi · 8 min
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18
Turn right onto West Main Street
1042 ft · 38 sec · West Main Street
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19
Turn right
21 m · 5 sec
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20
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between O'Fallon and Smithville.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 70 West
Merge slight left
201 mi · 03h 46m
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.
Mostly Sunny leaving O'Fallon and Showers And Thunderstorms Likely near Smithville.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Smithville?
The road trip is about 237.1 miles (381.5 km) and usually takes 04h 32m 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?
Boonville is a useful midpoint, sitting about 118.3 miles from O'Fallon and 118.7 miles from Smithville.
How much longer is the road route than the straight-line distance?
The direct path is about 211.9 miles (341 km), while the road route adds roughly 25.2 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 7:56 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $31.56 one way or $63.13 round trip. Estimated CO2 is about 74.4 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around O'Fallon and Showers And Thunderstorms Likely near Smithville.
Stop Ideas Near Boonville
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 Boonville.
Sedalia
Jefferson City
Warrensburg
Hermann
Flight Path Map
This map shows the direct air route between O'Fallon and Smithville. Straight-line distance: 211.87 mi (340.97 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Smithville
City in Tennessee
| Population | 11,011 |
| Coordinates | 39.3869400, -94.5810700 |
| Altitude | 248 |
| Country | United States |
End: Smithville (-94.58107, 39.38694)
Estimated Travel Time
Distance: 382 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 53m |
| 40 mph (64.37 km/h) | 05h 55m |
| 50 mph (80.47 km/h) | 04h 44m |
| 60 mph (96.56 km/h) | 03h 57m |
| 70 mph (112.65 km/h) | 03h 23m |
| 80 mph (129 km/h) | 02h 57m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $31.56 | $63.13 |
| Mid-grade | $4.25 | $35.60 | $71.20 |
| Premium | $4.65 | $38.95 | $77.91 |
| Diesel | $5.30 | $44.39 | $88.79 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.