How far is Weldon Spring, MO from O'Fallon, MO?
The driving distance from Weldon Spring, MO to O'Fallon, MO is about 7.8 miles (12.6 km), with a travel time of about 00h 16m by car.
- The straight-line flight distance is about 6.7 miles (10.8 km).
- For a round trip, plan for roughly 00h 32m 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 16m.
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.
Showers And Thunderstorms
Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Weldon Spring and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Weldon Spring and O'Fallon.
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1
Start on Old 94 South
45 m · 9 sec · Old 94 South
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2
Turn right onto Weldon Spring Road
80 m · 7 sec · Weldon Spring Road
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3
Merge slight left
120 m · 8 sec
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4
Keep slight right to continue on North Outer Road
2925 ft · 55 sec · North Outer Road
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5
Continue on North Outer Road
946 ft · 18 sec · North Outer Road
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6
Turn right
3.3 mi · 5 min
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7
Continue straight
1.5 mi · 3 min
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8
Continue straight
1.6 mi · 3 min
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9
Continue on South Main Street
3115 ft · 2 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 Weldon Spring 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.
Longest stretch
Turn right
3.28 mi · 00h 05m
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.
Showers And Thunderstorms leaving Weldon Spring and 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 Weldon Spring to O'Fallon?
The road trip is about 7.8 miles (12.6 km) and usually takes 00h 16m 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?
Dardenne Prairie is a useful midpoint, sitting about 3.9 miles from Weldon Spring and 3.9 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 6.7 miles (10.8 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 7:58 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $1.06 one way or $2.11 round trip. Estimated CO2 is about 2.5 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around Weldon Spring and Showers And Thunderstorms near O'Fallon.
Stop Ideas Near Dardenne Prairie
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
City Hall Park
City of O'Fallon
Swingley Ridge @ Chesterfield City Hall SB
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Dardenne Prairie.
Washington
Kirkwood
Gateway Transportation Center
Alton
Flight Path Map
This map shows the direct air route between Weldon Spring and O'Fallon. Straight-line distance: 6.74 mi (10.85 km).
#1 Weldon Spring
City in Saint Charles County, Missouri, United States
| Population | 5,546 |
| Coordinates | 38.7133900, -90.6892900 |
| Altitude | 165 |
| 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: 13 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 15m |
| 40 mph (64.37 km/h) | 00h 11m |
| 50 mph (80.47 km/h) | 00h 09m |
| 60 mph (96.56 km/h) | 00h 07m |
| 70 mph (112.65 km/h) | 00h 06m |
| 80 mph (129 km/h) | 00h 05m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $1.06 | $2.11 |
| Mid-grade | $4.25 | $1.19 | $2.38 |
| Premium | $4.65 | $1.30 | $2.61 |
| Diesel | $5.30 | $1.49 | $2.97 |
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 24, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.