How far is Hillsdale, MO from O'Fallon, MO?
The driving distance from Hillsdale, MO to O'Fallon, MO is about 26.9 miles (43.3 km), with a travel time of about 00h 30m by car.
- The straight-line flight distance is about 24 miles (38.7 km).
- For a round trip, plan for roughly 01h 01m 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 30m.
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.
A city in St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Clear
Sunny
Driving Route Map
The map below follows the saved road route between Hillsdale and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Hillsdale and O'Fallon.
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1
Start on Saint Louis Avenue
3115 ft · 1 min · Saint Louis Avenue
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2
Turn right onto Lucas-Hunt Road
1 mi · 2 min · Lucas-Hunt Road
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3
Turn left onto Natural Bridge Road
1477 ft · 27 sec · Natural Bridge Road
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4
Enter the roundabout and take exit 1 toward Florissant Road
15 m · 1 sec · Florissant Road
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5
Exit the roundabout onto Florissant Road
1.6 km · 1 min · Florissant Road
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6
Continue on University Boulevard
1533 ft · 30 sec · University Boulevard
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7
Take the ramp slight left toward I 70 West
2322 ft · 36 sec
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8
Keep slight left to continue on I 70 West: Wentzville
825 ft · 13 sec
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9
Merge slight left
21.1 mi · 27 min
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10
Take the exit slight right toward MO K: O'Fallon, Main Street
119 m · 8 sec
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11
Turn straight onto East Terra Lane
1.4 km · 2 min · East Terra Lane
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12
Turn right onto South Main Street
2830 ft · 1 min · South Main Street
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13
Turn right
8 m · 2 sec
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14
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Hillsdale 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.
I 70 West
Merge slight left
21.1 mi · 00h 27m
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 Clear leaving Hillsdale and Sunny near O'Fallon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Hillsdale to O'Fallon?
The road trip is about 26.9 miles (43.3 km) and usually takes 00h 30m 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?
Saint Charles is a useful midpoint, sitting about 13.2 miles from Hillsdale and 13.7 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 24 miles (38.7 km), while the road route adds roughly 2.9 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 7:28 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.58 one way or $7.16 round trip. Estimated CO2 is about 8.4 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Clear around Hillsdale and Sunny near O'Fallon.
Stop Ideas Near Saint Charles
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 Saint Charles.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between Hillsdale and O'Fallon. Straight-line distance: 24.07 mi (38.74 km).
#1 Hillsdale
Human settlement in St.
| Population | 1,536 |
| Coordinates | 38.6833800, -90.2840000 |
| Altitude | 170 |
| 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: 43 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 53m |
| 40 mph (64.37 km/h) | 00h 40m |
| 50 mph (80.47 km/h) | 00h 32m |
| 60 mph (96.56 km/h) | 00h 26m |
| 70 mph (112.65 km/h) | 00h 23m |
| 80 mph (129 km/h) | 00h 20m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.58 | $7.16 |
| Mid-grade | $4.25 | $4.04 | $8.08 |
| Premium | $4.65 | $4.42 | $8.84 |
| Diesel | $5.30 | $5.04 | $10.08 |
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 · May 07, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.