How far is Clarkton, MO from O'Fallon, MO?
The driving distance from Clarkton, MO to O'Fallon, MO is about 217.2 miles (349.6 km), with a travel time of about 03h 25m by car.
- The straight-line flight distance is about 167.8 miles (270.1 km).
- For a round trip, plan for roughly 06h 51m 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 25m.
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.
Village in the United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Clarkton and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Clarkton and O'Fallon.
-
1
Start on East Clark Street
33 m · 7 sec · East Clark Street
-
2
Turn right onto North Main Street
1.1 km · 2 min · North Main Street
-
3
Continue straight
1437 ft · 41 sec
-
4
At the end of the road, turn right
25.1 mi · 37 min
-
5
Take the ramp slight right
16.1 mi · 19 min
-
6
Continue straight
7.1 mi · 8 min
-
7
Take the exit slight right toward I 55 North: Saint Louis
1793 ft · 44 sec
-
8
Merge slight left
27.4 mi · 29 min
-
9
Keep slight left
101.5 mi · 1 hr 49 min
-
10
Continue on Rosa Parks Highway
1.3 mi · 2 min · Rosa Parks Highway
-
11
Take the exit slight right toward I 270 West, I 255 East: Kansas City, Chicago
1279 ft · 27 sec
-
12
Keep slight left to continue on I 270 West: Kansas City
118 m · 8 sec
-
13
Continue on I 270 West
1.2 km · 1 min
-
14
Merge slight left
18.1 mi · 23 min
-
15
Take the exit slight right toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
1 mi · 1 min
-
16
Keep slight left to continue on I 70 West: Kansas City
645 ft · 11 sec
-
17
Continue on I 70 West: Kansas City
1 km · 57 sec
-
18
Merge slight left
13.6 mi · 17 min
-
19
Take the exit slight right toward MO K: O'Fallon, Main Street
119 m · 8 sec
-
20
Turn straight onto East Terra Lane
1.4 km · 2 min · East Terra Lane
-
21
Turn right onto South Main Street
2830 ft · 1 min · South Main Street
-
22
Turn right
8 m · 2 sec
-
23
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Clarkton 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.
I 55 North
Keep slight left
102 mi · 01h 49m
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 Clarkton and Mostly Sunny near O'Fallon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Clarkton to O'Fallon?
The road trip is about 217.2 miles (349.6 km) and usually takes 03h 25m 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?
Longtown is a useful midpoint, sitting about 108 miles from Clarkton and 109.2 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 167.8 miles (270.1 km), while the road route adds roughly 49.4 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 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 10:08 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $28.92 one way or $57.85 round trip. Estimated CO2 is about 68.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Clarkton and Mostly Sunny near O'Fallon.
Stop Ideas Near Longtown
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 Longtown.
Carbondale station
Du Quoin
Marion, IL
Vienna, IL
Flight Path Map
This map shows the direct air route between Clarkton and O'Fallon. Straight-line distance: 167.84 mi (270.11 km).
#1 Clarkton
City in Dunklin County, Missouri, United States
| Population | 1,139 |
| Coordinates | 36.4517300, -89.9670400 |
| Altitude | 86 |
| 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: 350 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 14m |
| 40 mph (64.37 km/h) | 05h 25m |
| 50 mph (80.47 km/h) | 04h 20m |
| 60 mph (96.56 km/h) | 03h 37m |
| 70 mph (112.65 km/h) | 03h 06m |
| 80 mph (129 km/h) | 02h 42m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $28.92 | $57.85 |
| Mid-grade | $4.25 | $32.62 | $65.24 |
| Premium | $4.65 | $35.70 | $71.39 |
| Diesel | $5.30 | $40.68 | $81.36 |
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.