How far is Wentzville, MO from O'Fallon, MO?
The driving distance from Wentzville, MO to O'Fallon, MO is about 9.4 miles (15.2 km), with a travel time of about 00h 11m by car.
- The straight-line flight distance is about 8.3 miles (13.3 km).
- For a round trip, plan for roughly 00h 23m 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 11m.
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.
City in Saint Charles County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms
Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Wentzville and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Wentzville and O'Fallon.
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1
Start on East Allen Street
12 m · 4 sec · East Allen Street
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2
Turn right onto North Linn Avenue
65 m · 9 sec · North Linn Avenue
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3
Turn right onto East Pearce Boulevard
2469 ft · 1 min · East Pearce Boulevard
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4
Turn slight right
106 m · 9 sec
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5
Turn slight right onto Luetkenhaus Boulevard
152 m · 14 sec · Luetkenhaus Boulevard
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6
Take the ramp straight toward US 61 South, I 70, US 40
50 m · 2 sec
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7
Keep slight left to continue on US 61 South
772 ft · 11 sec
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8
Merge slight left onto Avenue of the Saints
2979 ft · 42 sec · Avenue of the Saints
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9
Take the exit slight left toward I 70 East: Saint Louis
2705 ft · 51 sec
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10
Merge slight left onto Dwight D Eisenhower Highway
6.4 mi · 8 min · Dwight D Eisenhower Highway
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11
Take the exit slight right toward MO K: O'Fallon
1765 ft · 43 sec
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12
Turn straight onto Drennen Parkway
46 m · 3 sec · Drennen Parkway
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13
Keep slight right to continue on Drennen Parkway
51 m · 6 sec · Drennen Parkway
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14
Turn slight left onto MO K: O'Fallon
19 m · 3 sec
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15
Continue on South Main Street
3115 ft · 2 min · South Main Street
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16
Turn right
8 m · 2 sec
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17
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Wentzville 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.
Dwight D Eisenhower Highway
Merge slight left onto Dwight D Eisenhower Highway
6.37 mi · 00h 08m
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.
Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms leaving Wentzville and Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms near O'Fallon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Wentzville to O'Fallon?
The road trip is about 9.4 miles (15.2 km) and usually takes 00h 11m 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?
Lake Saint Louis is a useful midpoint, sitting about 4.7 miles from Wentzville and 4.8 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 8.3 miles (13.3 km), while the road route adds roughly 1.1 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 8:06 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $1.24 one way or $2.49 round trip. Estimated CO2 is about 2.9 kg one way.
What should you check before leaving?
Before you leave, expect Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms around Wentzville and Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms near O'Fallon.
Stop Ideas Near Lake Saint Louis
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 Lake Saint Louis.
Washington
Kirkwood
Gateway Transportation Center
Hermann
Flight Path Map
This map shows the direct air route between Wentzville and O'Fallon. Straight-line distance: 8.24 mi (13.26 km).
#1 Wentzville
A city in St.
| Population | 43,109 |
| Coordinates | 38.8114400, -90.8529100 |
| Altitude | 190 |
| 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: 15 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 18m |
| 40 mph (64.37 km/h) | 00h 14m |
| 50 mph (80.47 km/h) | 00h 11m |
| 60 mph (96.56 km/h) | 00h 09m |
| 70 mph (112.65 km/h) | 00h 08m |
| 80 mph (129 km/h) | 00h 07m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $1.24 | $2.49 |
| Mid-grade | $4.25 | $1.40 | $2.81 |
| Premium | $4.65 | $1.54 | $3.07 |
| Diesel | $5.30 | $1.75 | $3.50 |
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 · May 31, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.