How far is O'Fallon, MO from Washington County, MO?
The driving distance from O'Fallon, MO to Washington County, MO is about 95.3 miles (153.4 km), with a travel time of about 02h 17m by car.
- The straight-line flight distance is about 59.5 miles (95.7 km).
- For a round trip, plan for roughly 04h 35m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 17m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
Human settlement in Jefferson County, Missouri, United States of America
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 O'Fallon and Washington County.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Washington County.
-
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
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4
Take the ramp slight left toward I 70 East: Saint Louis
133 m · 6 sec
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5
Merge slight left
13.5 mi · 17 min
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6
Take the exit slight right toward I 270: Chicago, Memphis
872 ft · 12 sec
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7
Keep slight right to continue on I 270 South: Memphis
2339 ft · 33 sec
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8
Continue on I 270 South: Memphis
723 ft · 10 sec
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9
Merge slight left
15.6 mi · 19 min
-
10
Take the exit slight right toward MO 30: Gravois Road
1580 ft · 34 sec
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11
Keep slight right to continue on MO 30 West: Fenton
93 m · 8 sec
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12
Merge slight left
2.4 mi · 3 min
-
13
Take the exit slight right toward MO 141: Fenton, Valley Park
1188 ft · 27 sec
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14
Turn left
4 mi · 6 min
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15
Take the exit slight right toward MO 21 South: Hillsboro
1043 ft · 14 sec
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16
Merge slight left onto Veterans Memorial Highway
19.8 mi · 23 min · Veterans Memorial Highway
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17
At the end of the road, turn left
2501 ft · 49 sec
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18
Continue straight
29.3 mi · 46 min
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19
Turn right onto East High Street
1.5 mi · 2 min · East High Street
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20
Turn straight
1.4 mi · 3 min
-
21
Turn left
3.8 mi · 9 min
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22
Turn left
2765 ft · 2 min
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23
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between O'Fallon and Washington County.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Veterans Memorial Highway
Continue straight
29.3 mi · 00h 46m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Showers And Thunderstorms leaving O'Fallon and Showers And Thunderstorms near Washington County.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Washington County?
The road trip is about 95.3 miles (153.4 km) and usually takes 02h 17m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Scotsdale is a useful midpoint, sitting about 47.7 miles from O'Fallon and 47.7 miles from Washington County.
How much longer is the road route than the straight-line distance?
The direct path is about 59.5 miles (95.7 km), while the road route adds roughly 35.8 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 1:54 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $13.36 one way or $26.71 round trip. Estimated CO2 is about 29.9 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around O'Fallon and Showers And Thunderstorms near Washington County.
Stop Ideas Near Scotsdale
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Scotsdale.
Kirkwood
Washington
Gateway Transportation Center
Alton
Flight Path Map
This map shows the direct air route between O'Fallon and Washington County. Straight-line distance: 59.44 mi (95.66 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Washington County
County in Missouri, United States
| Population | 24,604 |
| Coordinates | 37.9616800, -90.8774200 |
| Altitude | 292 |
| Country | United States |
End: Washington County (-90.87742, 37.96168)
Estimated Travel Time
Distance: 153 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 10m |
| 40 mph (64.37 km/h) | 02h 22m |
| 50 mph (80.47 km/h) | 01h 54m |
| 60 mph (96.56 km/h) | 01h 35m |
| 70 mph (112.65 km/h) | 01h 21m |
| 80 mph (129 km/h) | 01h 11m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.98 | $13.36 | $26.71 |
| Mid-grade | $4.34 | $14.59 | $29.17 |
| Premium | $4.71 | $15.82 | $31.63 |
| Diesel | $5.99 | $20.12 | $40.24 |
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 · Oct 15, 2026