How far is O'Fallon, MO from Saint Robert, MO?
The driving distance from O'Fallon, MO to Saint Robert, MO is about 127.4 miles (205.1 km), with a travel time of about 02h 34m by car.
- The straight-line flight distance is about 105 miles (169 km).
- For a round trip, plan for roughly 05h 09m 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 34m.
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 United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms Likely
Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between O'Fallon and Saint Robert.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Saint Robert.
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1
Start on the route
8 m · 7 sec
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2
Turn left onto South Main Street
2865 ft · 1 min · South Main Street
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3
Continue straight
3.1 mi · 6 min
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4
Continue straight
3.4 mi · 5 min
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5
Take the ramp slight right toward I 64 East, US 40 East, US 61 South
1523 ft · 22 sec
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6
Merge slight left onto Avenue of the Saints
3.7 mi · 5 min · Avenue of the Saints
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7
Take the exit slight right toward Chesterfield Airport Road
2700 ft · 58 sec
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8
Continue on Chesterfield Airport Road
110 m · 7 sec · Chesterfield Airport Road
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9
Turn right onto Olive Street Road
64 m · 5 sec
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10
Turn right onto Olive Street Road
1.5 km · 2 min · Olive Street Road
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11
Continue on North Eatherton Road
2.4 mi · 5 min · North Eatherton Road
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12
Enter the roundabout and take exit 2 toward the route
21 m · 1 sec
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13
Exit the roundabout
4.3 mi · 7 min
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14
Enter the roundabout and take exit 2 toward the route
29 m · 2 sec
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15
Exit the roundabout
2098 ft · 45 sec
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16
Enter the roundabout and take exit 2 toward MO 100 West: Gray Summit
23 m · 2 sec
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17
Exit the roundabout onto MO 100 West: Gray Summit
1202 ft · 33 sec
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18
Merge slight left
13.3 mi · 19 min
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19
Take the exit slight right toward I 44 West, US 50 West: St. Clair
1157 ft · 14 sec
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20
Merge slight left
93.3 mi · 1 hr 41 min
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21
Take the exit slight right toward I 44 Business: Waynesville
1099 ft · 23 sec
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22
Turn straight
2769 ft · 57 sec
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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 Saint Robert.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 44 West
Merge slight left
93.3 mi · 01h 41m
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 Likely leaving O'Fallon and Showers And Thunderstorms near Saint Robert.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Saint Robert?
The road trip is about 127.4 miles (205.1 km) and usually takes 02h 34m 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?
West Sullivan is a useful midpoint, sitting about 63.7 miles from O'Fallon and 63.8 miles from Saint Robert.
How much longer is the road route than the straight-line distance?
The direct path is about 105 miles (169 km), while the road route adds roughly 22.4 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 1:20 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $16.97 one way or $33.94 round trip. Estimated CO2 is about 40 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms Likely around O'Fallon and Showers And Thunderstorms near Saint Robert.
Stop Ideas Near West Sullivan
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 West Sullivan.
Washington
Hermann
Kirkwood
Jefferson City
Flight Path Map
This map shows the direct air route between O'Fallon and Saint Robert. Straight-line distance: 105 mi (168.98 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Saint Robert
City in Pulaski County, Missouri, United States
| Population | 6,358 |
| Coordinates | 37.8281000, -92.1776700 |
| Altitude | 317 |
| Country | United States |
End: Saint Robert (-92.17767, 37.8281)
Estimated Travel Time
Distance: 205 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 14m |
| 40 mph (64.37 km/h) | 03h 11m |
| 50 mph (80.47 km/h) | 02h 32m |
| 60 mph (96.56 km/h) | 02h 07m |
| 70 mph (112.65 km/h) | 01h 49m |
| 80 mph (129 km/h) | 01h 35m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $16.97 | $33.94 |
| Mid-grade | $4.25 | $19.14 | $38.28 |
| Premium | $4.65 | $20.94 | $41.89 |
| Diesel | $5.30 | $23.87 | $47.74 |
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 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.