How far is O'Fallon, MO from La Monte, MO?
The driving distance from O'Fallon, MO to La Monte, MO is about 170.8 miles (274.9 km), with a travel time of about 03h 21m by car.
- The straight-line flight distance is about 146.8 miles (236.2 km).
- For a round trip, plan for roughly 06h 43m 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 21m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
This departure sits inside the recommended comfort window for the route.
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 O'Fallon and La Monte.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and La Monte.
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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
139.5 mi · 2 hr 40 min
-
8
Take the exit slight right toward US 65 South: Sedalia
1094 ft · 37 sec
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9
Merge slight left
18.6 mi · 23 min
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10
Turn right onto West Broadway Boulevard
10.8 mi · 14 min · West Broadway Boulevard
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11
Take the exit right
26 m · 4 sec
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12
Turn right onto Front Street
678 ft · 19 sec · Front Street
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13
Turn left onto South Main Street
1.2 km · 1 min · South Main Street
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14
Turn left onto West Pine Street
67 m · 10 sec · West Pine Street
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15
Arrive at your destination
0 m · 1 sec · West Pine Street
Car Route Details
A richer read on the saved driving route between O'Fallon and La Monte.
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
139 mi · 02h 40m
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.
Sunny leaving O'Fallon and Sunny near La Monte.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to La Monte?
The road trip is about 170.8 miles (274.9 km) and usually takes 03h 21m 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?
Columbia is a useful midpoint, sitting about 85.3 miles from O'Fallon and 85.6 miles from La Monte.
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 24 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 10:16 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $22.74 one way or $45.48 round trip. Estimated CO2 is about 53.6 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around O'Fallon and Sunny near La Monte.
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 O'Fallon and La Monte. Straight-line distance: 146.79 mi (236.23 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 La Monte
City in Pettis County, Missouri, United States
| Population | 1,137 |
| Coordinates | 38.7741800, -93.4252100 |
| Altitude | 262 |
| Country | United States |
End: La Monte (-93.42521, 38.77418)
Estimated Travel Time
Distance: 275 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 41m |
| 40 mph (64.37 km/h) | 04h 16m |
| 50 mph (80.47 km/h) | 03h 24m |
| 60 mph (96.56 km/h) | 02h 50m |
| 70 mph (112.65 km/h) | 02h 26m |
| 80 mph (129 km/h) | 02h 07m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $22.74 | $45.48 |
| Mid-grade | $4.25 | $25.65 | $51.29 |
| Premium | $4.65 | $28.06 | $56.13 |
| Diesel | $5.30 | $31.98 | $63.97 |
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.