How far is La Monte, MO from O'Fallon, MO?
The driving distance from La Monte, MO to O'Fallon, MO is about 164.2 miles (264.2 km), with a travel time of about 02h 38m by car.
- The straight-line flight distance is about 146.8 miles (236.2 km).
- For a round trip, plan for roughly 05h 16m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 38m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
The most populous city in the state of Missouri.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between La Monte and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between La Monte and O'Fallon.
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1
Start on West Pine Street
67 m · 12 sec · West Pine Street
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2
Turn right onto South Main Street
1.2 km · 1 min · South Main Street
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3
At the end of the road, turn left onto Front Street
1989 ft · 1 min · Front Street
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4
At the end of the road, turn right onto Pleasant Green Road
29 m · 4 sec · Pleasant Green Road
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5
Turn left
8.4 mi · 10 min
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6
Turn left onto West Main Street
57 m · 7 sec · West Main Street
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7
Continue on West Main Street
1.7 mi · 4 min · West Main Street
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8
Take the ramp right toward US 65 South
727 ft · 27 sec
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9
Turn sharp left
17.9 mi · 21 min
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10
Take the exit slight right toward I 70 East: Saint Louis
1866 ft · 40 sec
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11
Merge slight left onto U.S. Submarine Veterans' Memorial Highway
22.9 mi · 25 min · U.S. Submarine Veterans' Memorial Highway
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12
Keep slight left to continue on U.S. Submarine Veterans' Memorial Highway
22.4 mi · 24 min · U.S. Submarine Veterans' Memorial Highway
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13
Continue on Dwight D. Eisenhower Highway
1.8 mi · 2 min · Dwight D. Eisenhower Highway
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14
Continue on Highway Patrol Sgt. Benjamin Booth Memorial Highway
1.6 mi · 2 min · Highway Patrol Sgt. Benjamin Booth Memorial Highway
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15
Continue on Sheriff Roger I. Wilson Memorial Highway
1.9 mi · 2 min · Sheriff Roger I. Wilson Memorial Highway
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16
Continue on Dwight D. Eisenhower Highway
88.2 mi · 1 hr 44 min · Dwight D. Eisenhower Highway
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17
Take the exit slight right toward MO K: O'Fallon
1765 ft · 43 sec
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18
Turn straight onto Drennen Parkway
46 m · 3 sec · Drennen Parkway
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19
Keep slight right to continue on Drennen Parkway
51 m · 6 sec · Drennen Parkway
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20
Turn slight left onto MO K: O'Fallon
19 m · 3 sec
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21
Continue on South Main Street
3115 ft · 2 min · South Main Street
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22
Turn right
8 m · 2 sec
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23
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between La Monte and O'Fallon.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Dwight D. Eisenhower Highway
Continue on Dwight D. Eisenhower Highway
88.2 mi · 01h 44m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving La Monte 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 La Monte to O'Fallon?
The road trip is about 164.2 miles (264.2 km) and usually takes 02h 38m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Columbia is a useful midpoint, sitting about 84.7 miles from La Monte and 79.5 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 146.8 miles (236.2 km), while the road route adds roughly 17.4 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 1:14 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $21.83 one way or $43.67 round trip. Estimated CO2 is about 51.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around La Monte and Sunny near O'Fallon.
Stop Ideas Near Columbia
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 Columbia.
Jefferson City
Sedalia
Hermann
Flight Path Map
This map shows the direct air route between La Monte and O'Fallon. Straight-line distance: 146.79 mi (236.23 km).
#1 La Monte
City in Pettis County, Missouri, United States
| Population | 1,137 |
| Coordinates | 38.7741800, -93.4252100 |
| Altitude | 262 |
| 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: 264 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 28m |
| 40 mph (64.37 km/h) | 04h 06m |
| 50 mph (80.47 km/h) | 03h 16m |
| 60 mph (96.56 km/h) | 02h 44m |
| 70 mph (112.65 km/h) | 02h 20m |
| 80 mph (129 km/h) | 02h 02m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $21.83 | $43.67 |
| Mid-grade | $4.25 | $24.62 | $49.25 |
| Premium | $4.65 | $26.95 | $53.89 |
| Diesel | $5.30 | $30.71 | $61.42 |
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.