How far is Washington, MO from O'Fallon, MO?
The driving distance from Washington, MO to O'Fallon, MO is about 35.7 miles (57.4 km), with a travel time of about 00h 43m by car.
- The straight-line flight distance is about 24.2 miles (39 km).
- For a round trip, plan for roughly 01h 27m 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 43m.
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.
City in Saint Charles County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Washington and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Washington and O'Fallon.
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1
Start on West 3rd Street
1.1 km · 2 min · West 3rd Street
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2
Turn left onto Franklin Avenue
3.4 mi · 5 min · Franklin Avenue
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3
Turn right
1.2 km · 2 min
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4
Continue straight
3.5 mi · 6 min
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5
At the end of the road, turn left
3.1 mi · 4 min
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6
Continue straight
4.9 mi · 7 min
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7
Turn left
7.2 mi · 11 min
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8
Take the ramp right toward I 70 East, US 40 East: Saint Louis
959 ft · 13 sec
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9
Merge slight left onto Dwight D Eisenhower Highway
7.8 mi · 9 min · Dwight D Eisenhower Highway
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10
Take the exit slight right toward MO K: O'Fallon
1765 ft · 43 sec
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11
Turn straight onto Drennen Parkway
46 m · 3 sec · Drennen Parkway
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12
Keep slight right to continue on Drennen Parkway
51 m · 6 sec · Drennen Parkway
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13
Turn slight left onto MO K: O'Fallon
19 m · 3 sec
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14
Continue on South Main Street
3115 ft · 2 min · South Main Street
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15
Turn right
8 m · 2 sec
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16
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Washington 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
7.78 mi · 00h 09m
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.
Partly Sunny leaving Washington and Partly Sunny near O'Fallon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Washington to O'Fallon?
The road trip is about 35.7 miles (57.4 km) and usually takes 00h 43m 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?
New Melle is a useful midpoint, sitting about 16.3 miles from Washington and 19.4 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 24.2 miles (39 km), while the road route adds roughly 11.5 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 7:02 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.75 one way or $9.50 round trip. Estimated CO2 is about 11.2 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Washington and Partly Sunny near O'Fallon.
Stop Ideas Near New Melle
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 New Melle.
Washington
Kirkwood
Hermann
Gateway Transportation Center
Flight Path Map
This map shows the direct air route between Washington and O'Fallon. Straight-line distance: 24.25 mi (39.02 km).
#1 Washington
City in Franklin County, Missouri
| Population | 14,243 |
| Coordinates | 38.5581100, -91.0120900 |
| Altitude | 168 |
| 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: 57 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 11m |
| 40 mph (64.37 km/h) | 00h 53m |
| 50 mph (80.47 km/h) | 00h 42m |
| 60 mph (96.56 km/h) | 00h 35m |
| 70 mph (112.65 km/h) | 00h 30m |
| 80 mph (129 km/h) | 00h 26m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $4.75 | $9.50 |
| Mid-grade | $4.25 | $5.36 | $10.72 |
| Premium | $4.65 | $5.86 | $11.73 |
| Diesel | $5.30 | $6.68 | $13.37 |
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 30, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.