How far is O'Fallon, MO from Sainte Genevieve County, MO?
The driving distance from O'Fallon, MO to Sainte Genevieve County, MO is about 90 miles (144.8 km), with a travel time of about 01h 52m by car.
- The straight-line flight distance is about 69 miles (111 km).
- For a round trip, plan for roughly 03h 44m 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 01h 52m.
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.
City in Jefferson County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between O'Fallon and Sainte Genevieve County.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Sainte Genevieve County.
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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
19 mi · 24 min
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10
Take the exit slight right toward I 55, US 61, US 67: Saint Louis, Memphis, Lemay Ferry Road
1911 ft · 27 sec
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11
Keep slight right to continue on I 55 South: Memphis
2031 ft · 44 sec
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12
Merge slight left onto Rosa Parks Highway
1.5 mi · 2 min · Rosa Parks Highway
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13
Continue on Officer Thomas G. Smith, Jr. Memorial Highway
1.8 mi · 2 min · Officer Thomas G. Smith, Jr. Memorial Highway
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14
Continue on Police Officer Steven Jarvis Memorial Highway
42.6 mi · 46 min · Police Officer Steven Jarvis Memorial Highway
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15
Take the exit slight right toward MO 32, MO A, MO B: Sainte Genevieve, Farmington
796 ft · 17 sec
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16
Turn sharp right
6.7 mi · 10 min
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17
Turn left onto River Aux Vases Church Road
1152 ft · 51 sec · River Aux Vases Church Road
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18
Turn left onto River Aux Vases Church Road
1.1 km · 3 min · River Aux Vases Church Road
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19
Turn left
3020 ft · 2 min
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20
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between O'Fallon and Sainte Genevieve 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.
Police Officer Steven Jarvis Memorial Highway
Continue on Police Officer Steven Jarvis Memorial Highway
42.6 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 Likely then Slight Chance Showers And Thunderstorms near Sainte Genevieve County.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Sainte Genevieve County?
The road trip is about 90 miles (144.8 km) and usually takes 01h 52m 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?
Kimmswick is a useful midpoint, sitting about 45 miles from O'Fallon and 45 miles from Sainte Genevieve County.
How much longer is the road route than the straight-line distance?
The direct path is about 69 miles (111 km), while the road route adds roughly 21 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 2:46 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $12.64 one way or $25.28 round trip. Estimated CO2 is about 28.3 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around O'Fallon and Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms near Sainte Genevieve County.
Stop Ideas Near Kimmswick
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 Kimmswick.
Kirkwood
Gateway Transportation Center
Washington
Alton
Flight Path Map
This map shows the direct air route between O'Fallon and Sainte Genevieve County. Straight-line distance: 68.97 mi (111 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Sainte Genevieve County
County in Missouri, United States
| Population | 17,919 |
| Coordinates | 37.8944000, -90.1944200 |
| Altitude | 218 |
| Country | United States |
End: Sainte Genevieve County (-90.19442, 37.8944)
Estimated Travel Time
Distance: 145 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 59m |
| 40 mph (64.37 km/h) | 02h 14m |
| 50 mph (80.47 km/h) | 01h 47m |
| 60 mph (96.56 km/h) | 01h 29m |
| 70 mph (112.65 km/h) | 01h 17m |
| 80 mph (129 km/h) | 01h 07m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.98 | $12.64 | $25.28 |
| Mid-grade | $4.34 | $13.80 | $27.61 |
| Premium | $4.71 | $14.97 | $29.94 |
| Diesel | $5.99 | $19.04 | $38.08 |
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