How far is Ontario, IL from Saint Augustine, IL?
The driving distance from Ontario, IL to Saint Augustine, IL is about 30.1 miles (48.4 km), with a travel time of about 00h 48m by car.
- The straight-line flight distance is about 25.5 miles (41 km).
- For a round trip, plan for roughly 01h 36m 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 00h 48m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
County seat of Knox County, Illinois, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Ontario and Saint Augustine.
Turn-by-Turn Driving Directions
Step-by-step road directions between Ontario and Saint Augustine.
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1
Start on Knox Highway 35
3.9 mi · 9 min · Knox Highway 35
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2
Turn left
6.6 mi · 10 min
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3
Take the ramp slight right
2731 ft · 1 min
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4
Merge slight left onto Chicago-Kansas City Expressway
2.1 mi · 2 min · Chicago-Kansas City Expressway
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5
Take the exit slight right toward IL 41, IL 164
2291 ft · 50 sec
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6
Keep slight left
32 m · 3 sec
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7
Turn left onto West Main Street
2749 ft · 58 sec · West Main Street
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8
Turn right onto South Linwood Road
10.1 mi · 15 min · South Linwood Road
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9
Continue on South Western Avenue
1617 ft · 32 sec · South Western Avenue
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10
Turn straight onto South Commercial Drive
5.6 mi · 8 min · South Commercial Drive
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11
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Ontario and Saint Augustine.
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.
South Linwood Road
Turn right onto South Linwood Road
10.1 mi · 00h 15m
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.
Sunny leaving Ontario and Sunny near Saint Augustine.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Ontario to Saint Augustine?
The road trip is about 30.1 miles (48.4 km) and usually takes 00h 48m 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?
Galesburg is a useful midpoint, sitting about 15 miles from Ontario and 15 miles from Saint Augustine.
How much longer is the road route than the straight-line distance?
The direct path is about 25.5 miles (41 km), while the road route adds roughly 4.6 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 4:54 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.00 one way or $7.99 round trip. Estimated CO2 is about 9.4 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Ontario and Sunny near Saint Augustine.
Stop Ideas Near Galesburg
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 Galesburg.
Galesburg station
Kewanee
Moline, Illinois
Macomb
Flight Path Map
This map shows the direct air route between Ontario and Saint Augustine. Straight-line distance: 25.47 mi (40.99 km).
#1 Ontario
Unincorporated community in Illinois
| Population | 871 |
| Coordinates | 41.0786500, -90.3076300 |
| Altitude | 246 |
| Country | United States |
#2 Saint Augustine
Human settlement in Knox County, Illinois, United States of America
| Population | 111 |
| Coordinates | 40.7183700, -90.4109600 |
| Altitude | 196 |
| Country | United States |
End: Saint Augustine (-90.41096, 40.71837)
Estimated Travel Time
Distance: 48 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 00m |
| 40 mph (64.37 km/h) | 00h 45m |
| 50 mph (80.47 km/h) | 00h 36m |
| 60 mph (96.56 km/h) | 00h 30m |
| 70 mph (112.65 km/h) | 00h 25m |
| 80 mph (129 km/h) | 00h 22m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $4.00 | $7.99 |
| Mid-grade | $4.25 | $4.51 | $9.02 |
| Premium | $4.65 | $4.93 | $9.87 |
| Diesel | $5.30 | $5.62 | $11.24 |
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 Illinois · May 14, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.