How far is Clarkson Valley, MO from O'Fallon, MO?
The driving distance from Clarkson Valley, MO to O'Fallon, MO is about 20 miles (32.2 km), with a travel time of about 00h 29m by car.
- The straight-line flight distance is about 14.5 miles (23.4 km).
- For a round trip, plan for roughly 00h 59m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM CDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 29m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
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.
Driving Route Map
The map below follows the saved road route between Clarkson Valley and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Clarkson Valley and O'Fallon.
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1
Start on Greenbank Drive
1553 ft · 1 min · Greenbank Drive
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2
At the end of the road, turn right onto Forest Club Drive
105 m · 21 sec · Forest Club Drive
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3
At the end of the road, turn left onto Clarkson Road
2.7 mi · 5 min · Clarkson Road
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4
Continue on Olive Boulevard
147 m · 17 sec · Olive Boulevard
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5
Turn left onto North Outer 40
2087 ft · 58 sec · North Outer 40
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6
Take the ramp slight left toward I 64 West, US 40 West, US 61 North
139 m · 11 sec
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7
Merge slight left onto Avenue of the Saints
8.8 mi · 11 min · Avenue of the Saints
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8
Take the exit slight right toward MO K: O'Fallon
100 m · 6 sec
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9
Merge slight right onto North Outer Road
1650 ft · 31 sec · North Outer Road
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10
Continue on North Outer Road
946 ft · 18 sec · North Outer Road
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11
Turn right
3.3 mi · 5 min
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12
Continue straight
1.5 mi · 3 min
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13
Continue straight
1.6 mi · 3 min
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14
Continue on South Main Street
3115 ft · 2 min · South Main Street
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15
Turn right
8 m · 2 sec
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16
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Clarkson Valley and O'Fallon.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
Avenue of the Saints
Merge slight left onto Avenue of the Saints
8.8 mi · 00h 11m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Sunny leaving Clarkson Valley 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 Clarkson Valley to O'Fallon?
The road trip is about 20 miles (32.2 km) and usually takes 00h 29m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Weldon Spring Heights is a useful midpoint, sitting about 10 miles from Clarkson Valley and 10 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 14.5 miles (23.4 km), while the road route adds roughly 5.5 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 7:00 AM to 7:00 PM CDT. If you want a more comfortable same-day return, try to leave by 7:30 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.68 one way or $5.35 round trip. Estimated CO2 is about 6.3 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Clarkson Valley and Sunny near O'Fallon.
Stop Ideas Near Weldon Spring Heights
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
City Hall Park
City of O'Fallon
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Weldon Spring Heights.
Kirkwood
Washington
Gateway Transportation Center
Alton
Flight Path Map
This map shows the direct air route between Clarkson Valley and O'Fallon. Straight-line distance: 14.56 mi (23.43 km).
#1 Clarkson Valley
City in Saint Louis County, Missouri, United States
| Population | 2,604 |
| Coordinates | 38.6183900, -90.5892900 |
| Altitude | 180 |
| 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: 32 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 39m |
| 40 mph (64.37 km/h) | 00h 29m |
| 50 mph (80.47 km/h) | 00h 23m |
| 60 mph (96.56 km/h) | 00h 19m |
| 70 mph (112.65 km/h) | 00h 17m |
| 80 mph (129 km/h) | 00h 14m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $2.68 | $5.35 |
| Mid-grade | $4.25 | $3.02 | $6.04 |
| Premium | $4.65 | $3.30 | $6.61 |
| Diesel | $5.30 | $3.77 | $7.53 |
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.