How far is Berkeley, MO from O'Fallon, MO?
The driving distance from Berkeley, MO to O'Fallon, MO is about 23.3 miles (37.5 km), with a travel time of about 00h 25m by car.
- The straight-line flight distance is about 20.3 miles (32.6 km).
- For a round trip, plan for roughly 00h 51m 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 25m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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.
A city in St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Berkeley and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Berkeley and O'Fallon.
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1
Start on Evergreen Boulevard
1653 ft · 1 min · Evergreen Boulevard
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2
Turn right onto Airport Road
2093 ft · 46 sec · Airport Road
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3
Take the ramp left toward I 170 South
1378 ft · 20 sec
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4
Merge slight left onto Inner Belt Expressway
1.3 km · 59 sec · Inner Belt Expressway
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5
Take the exit slight right toward I 70 West: Kansas City
2291 ft · 49 sec
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6
Merge slight left
19.6 mi · 24 min
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7
Take the exit slight right toward MO K: O'Fallon, Main Street
119 m · 8 sec
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8
Turn straight onto East Terra Lane
1.4 km · 2 min · East Terra Lane
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9
Turn right onto South Main Street
2830 ft · 1 min · South Main Street
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10
Turn right
8 m · 2 sec
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11
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Berkeley 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.
I 70 West
Merge slight left
19.6 mi · 00h 25m
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.
Mostly Sunny leaving Berkeley 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 Berkeley to O'Fallon?
The road trip is about 23.3 miles (37.5 km) and usually takes 00h 25m 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 11.6 miles from Berkeley and 11.7 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 20.3 miles (32.6 km), while the road route adds roughly 3 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 7:38 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.09 one way or $6.18 round trip. Estimated CO2 is about 7.3 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Berkeley and Mostly Sunny near O'Fallon.
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 Berkeley and O'Fallon. Straight-line distance: 20.23 mi (32.56 km).
#1 Berkeley
Suburb of St.
| Population | 8,892 |
| Coordinates | 38.7545000, -90.3312300 |
| Altitude | 164 |
| 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: 38 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 46m |
| 40 mph (64.37 km/h) | 00h 34m |
| 50 mph (80.47 km/h) | 00h 27m |
| 60 mph (96.56 km/h) | 00h 23m |
| 70 mph (112.65 km/h) | 00h 19m |
| 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 | $3.09 | $6.18 |
| Mid-grade | $4.25 | $3.49 | $6.97 |
| Premium | $4.65 | $3.82 | $7.63 |
| Diesel | $5.30 | $4.35 | $8.70 |
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.