How far is O'Fallon, MO from Monroe City, MO?
The driving distance from O'Fallon, MO to Monroe City, MO is about 103.3 miles (166.2 km), with a travel time of about 02h 06m by car.
- The straight-line flight distance is about 80.3 miles (129.3 km).
- For a round trip, plan for roughly 04h 13m 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 06m.
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 Missouri
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny then Chance Showers And Thunderstorms
Mostly Sunny then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between O'Fallon and Monroe City.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Monroe 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
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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
6.9 mi · 8 min
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8
Take the exit slight right toward US 61 North: Hannibal
2234 ft · 48 sec
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9
Merge slight left onto Avenue of the Saints
73.3 mi · 1 hr 27 min · Avenue of the Saints
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10
Take the exit slight left
76 m · 15 sec
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11
Turn left onto Paris Gravel Road
2645 ft · 1 min · Paris Gravel Road
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12
Keep slight right to continue on County Road 422
85 m · 9 sec · County Road 422
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13
Turn right onto Veterans Road
2.2 mi · 4 min · Veterans Road
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14
Take the ramp left toward US 36 West, MO 110 West: Monroe City
1226 ft · 16 sec
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15
Merge slight left onto V.F.W. Memorial Highway
5.8 mi · 7 min · V.F.W. Memorial Highway
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16
Continue on Chicago-Kansas City Expressway
10.7 mi · 12 min · Chicago-Kansas City Expressway
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17
Take the exit slight right toward US 24 West, US 36 Business, MO Z: Monroe City, Paris, Moberly
1822 ft · 56 sec
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18
Turn left
2267 ft · 38 sec
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19
Continue on 5th Street
1.1 mi · 2 min · 5th Street
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20
Turn left onto North Main Street
1353 ft · 23 sec · North Main Street
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21
Arrive at your destination
0 m · 1 sec · North Main Street
Car Route Details
A richer read on the saved driving route between O'Fallon and Monroe City.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Avenue of the Saints
Merge slight left onto Avenue of the Saints
73.3 mi · 01h 27m
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.
Mostly Sunny then Chance Showers And Thunderstorms leaving O'Fallon and Mostly Sunny then Chance Showers And Thunderstorms near Monroe City.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Monroe City?
The road trip is about 103.3 miles (166.2 km) and usually takes 02h 06m 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?
Bowling Green is a useful midpoint, sitting about 51.6 miles from O'Fallon and 51.6 miles from Monroe City.
How much longer is the road route than the straight-line distance?
The direct path is about 80.3 miles (129.3 km), while the road route adds roughly 23 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 2:16 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $13.73 one way or $27.45 round trip. Estimated CO2 is about 32.3 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Chance Showers And Thunderstorms around O'Fallon and Mostly Sunny then Chance Showers And Thunderstorms near Monroe City.
Stop Ideas Near Bowling Green
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 Bowling Green.
Quincy
Hermann
Washington
Alton
Flight Path Map
This map shows the direct air route between O'Fallon and Monroe City. Straight-line distance: 80.37 mi (129.35 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Monroe City
City in Monroe County, Missouri, United States
| Population | 2,438 |
| Coordinates | 39.6536500, -91.7346100 |
| Altitude | 227 |
| Country | United States |
End: Monroe City (-91.73461, 39.65365)
Estimated Travel Time
Distance: 166 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 26m |
| 40 mph (64.37 km/h) | 02h 34m |
| 50 mph (80.47 km/h) | 02h 03m |
| 60 mph (96.56 km/h) | 01h 43m |
| 70 mph (112.65 km/h) | 01h 28m |
| 80 mph (129 km/h) | 01h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $13.73 | $27.45 |
| Mid-grade | $4.25 | $15.48 | $30.96 |
| Premium | $4.65 | $16.94 | $33.88 |
| Diesel | $5.30 | $19.31 | $38.61 |
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 17, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.