How far is Marthasville, MO from O'Fallon, MO?
The driving distance from Marthasville, MO to O'Fallon, MO is about 33.2 miles (53.4 km), with a travel time of about 00h 39m by car.
- The straight-line flight distance is about 23.1 miles (37.1 km).
- For a round trip, plan for roughly 01h 19m 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 39m.
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.
Mostly Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Marthasville and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Marthasville and O'Fallon.
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1
Start on South 2nd Street
38 m · 11 sec · South 2nd Street
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2
Turn left onto East Main Street
758 ft · 26 sec · East Main Street
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3
Turn left onto One Street
1966 ft · 57 sec · One Street
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4
At the end of the road, turn left
3.4 mi · 5 min
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5
Turn left
1.2 km · 2 min
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6
Continue straight
3.5 mi · 6 min
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7
At the end of the road, turn left
3.1 mi · 4 min
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8
Continue straight
4.9 mi · 7 min
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9
Turn left
7.2 mi · 11 min
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10
Take the ramp right toward I 70 East, US 40 East: Saint Louis
959 ft · 13 sec
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11
Merge slight left onto Dwight D Eisenhower Highway
7.8 mi · 9 min · Dwight D Eisenhower Highway
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12
Take the exit slight right toward MO K: O'Fallon
1765 ft · 43 sec
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13
Turn straight onto Drennen Parkway
46 m · 3 sec · Drennen Parkway
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14
Keep slight right to continue on Drennen Parkway
51 m · 6 sec · Drennen Parkway
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15
Turn slight left onto MO K: O'Fallon
19 m · 3 sec
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16
Continue on South Main Street
3115 ft · 2 min · South Main Street
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17
Turn right
8 m · 2 sec
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18
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Marthasville 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.
Mostly Sunny leaving Marthasville 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 Marthasville to O'Fallon?
The road trip is about 33.2 miles (53.4 km) and usually takes 00h 39m 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 16.2 miles from Marthasville and 17 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 23.1 miles (37.1 km), while the road route adds roughly 10.1 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 7:10 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.41 one way or $8.82 round trip. Estimated CO2 is about 10.4 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Marthasville and Mostly 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 Marthasville and O'Fallon. Straight-line distance: 23.03 mi (37.07 km).
#1 Marthasville
City in Missouri
| Population | 1,198 |
| Coordinates | 38.6283800, -91.0576400 |
| Altitude | 171 |
| 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: 53 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 06m |
| 40 mph (64.37 km/h) | 00h 49m |
| 50 mph (80.47 km/h) | 00h 39m |
| 60 mph (96.56 km/h) | 00h 33m |
| 70 mph (112.65 km/h) | 00h 28m |
| 80 mph (129 km/h) | 00h 24m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $4.41 | $8.82 |
| Mid-grade | $4.25 | $4.98 | $9.95 |
| Premium | $4.65 | $5.45 | $10.89 |
| Diesel | $5.30 | $6.21 | $12.41 |
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 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.