How far is O'Fallon, MO from Cool Valley, MO?
The driving distance from O'Fallon, MO to Cool Valley, MO is about 23.5 miles (37.9 km), with a travel time of about 00h 33m by car.
- The straight-line flight distance is about 21.7 miles (35 km).
- For a round trip, plan for roughly 01h 06m 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 33m.
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.
A city in St.
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 Cool Valley.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Cool Valley.
-
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 Drennen Parkway
1.4 km · 1 min · Drennen Parkway
-
4
Take the ramp slight left toward I 70 East: Saint Louis
133 m · 6 sec
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5
Merge slight left
20.9 mi · 26 min
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6
Take the exit slight right toward North Hanley Road
1005 ft · 24 sec
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7
Turn straight onto North Hanley Road
857 ft · 21 sec · North Hanley Road
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8
Turn slight right
95 m · 11 sec
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9
Turn straight onto Evans Avenue
1396 ft · 1 min · Evans Avenue
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10
Turn left onto Hern Drive
1415 ft · 1 min · Hern Drive
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11
Turn right onto Hill Avenue
681 ft · 30 sec · Hill Avenue
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12
Arrive at your destination
0 m · 1 sec · Hill Avenue
Car Route Details
A richer read on the saved driving route between O'Fallon and Cool Valley.
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.
I 70 East
Merge slight left
20.9 mi · 00h 26m
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 O'Fallon and Sunny near Cool Valley.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Cool Valley?
The road trip is about 23.5 miles (37.9 km) and usually takes 00h 33m 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?
Saint Charles is a useful midpoint, sitting about 11.7 miles from O'Fallon and 11.8 miles from Cool Valley.
How much longer is the road route than the straight-line distance?
The direct path is about 21.7 miles (35 km), while the road route adds roughly 1.8 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 7:00 AM to 7:00 PM CDT. If you want a more comfortable same-day return, try to leave by 7:24 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.13 one way or $6.26 round trip. Estimated CO2 is about 7.4 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around O'Fallon and Sunny near Cool Valley.
Stop Ideas Near Saint Charles
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
City Hall Park
Jennings City Hall
Ferguson Finance Director
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Saint Charles.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between O'Fallon and Cool Valley. Straight-line distance: 21.76 mi (35.02 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Cool Valley
City in Saint Louis County, Missouri, United States
| Population | 1,127 |
| Coordinates | 38.7278300, -90.3101100 |
| Altitude | 180 |
| Country | United States |
End: Cool Valley (-90.31011, 38.72783)
Estimated Travel Time
Distance: 38 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 47m |
| 40 mph (64.37 km/h) | 00h 35m |
| 50 mph (80.47 km/h) | 00h 28m |
| 60 mph (96.56 km/h) | 00h 23m |
| 70 mph (112.65 km/h) | 00h 20m |
| 80 mph (129 km/h) | 00h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.13 | $6.26 |
| Mid-grade | $4.25 | $3.53 | $7.06 |
| Premium | $4.65 | $3.86 | $7.73 |
| Diesel | $5.30 | $4.40 | $8.80 |
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.