How far is O'Fallon, MO from Montgomery City, MO?
The driving distance from O'Fallon, MO to Montgomery City, MO is about 49.6 miles (79.8 km), with a travel time of about 01h 03m by car.
- The straight-line flight distance is about 44.8 miles (72.1 km).
- For a round trip, plan for roughly 02h 06m 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 01h 03m.
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.
City in Warren County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between O'Fallon and Montgomery City.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Montgomery City.
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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
-
3
Turn left onto I 70 East
10 m · 6 sec
-
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
42.4 mi · 51 min
-
8
Take the exit slight right toward MO 19: Hermann, New Florence
1223 ft · 26 sec
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9
Enter the roundabout and take exit 2 toward the route
52 m · 3 sec
-
10
Exit the roundabout
55 m · 3 sec
-
11
Continue straight
6 mi · 9 min
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12
Turn right onto East 2nd Street
12 m · 2 sec · East 2nd Street
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13
Arrive at your destination
0 m · 1 sec · East 2nd Street
Car Route Details
A richer read on the saved driving route between O'Fallon and Montgomery City.
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
42.4 mi · 00h 51m
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 O'Fallon and Sunny near Montgomery City.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Montgomery City?
The road trip is about 49.6 miles (79.8 km) and usually takes 01h 03m 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?
Warrenton is a useful midpoint, sitting about 24.7 miles from O'Fallon and 24.9 miles from Montgomery City.
How much longer is the road route than the straight-line distance?
The direct path is about 44.8 miles (72.1 km), while the road route adds roughly 4.8 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 4:24 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $6.60 one way or $13.20 round trip. Estimated CO2 is about 15.6 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around O'Fallon and Sunny near Montgomery City.
Stop Ideas Near Warrenton
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Warrenton City Animal Control
Moscow Mills City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Warrenton.
Hermann
Washington
Kirkwood
Gateway Transportation Center
Flight Path Map
This map shows the direct air route between O'Fallon and Montgomery City. Straight-line distance: 44.8 mi (72.1 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Montgomery City
City in Missouri, United States
| Population | 2,678 |
| Coordinates | 38.9775400, -91.5048800 |
| Altitude | 251 |
| Country | United States |
End: Montgomery City (-91.50488, 38.97754)
Estimated Travel Time
Distance: 80 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 39m |
| 40 mph (64.37 km/h) | 01h 14m |
| 50 mph (80.47 km/h) | 00h 59m |
| 60 mph (96.56 km/h) | 00h 49m |
| 70 mph (112.65 km/h) | 00h 42m |
| 80 mph (129 km/h) | 00h 37m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $6.60 | $13.20 |
| Mid-grade | $4.25 | $7.44 | $14.89 |
| Premium | $4.65 | $8.14 | $16.29 |
| Diesel | $5.30 | $9.28 | $18.56 |
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.