How far is Oak Forest, IL from Decatur, IL?
The driving distance from Oak Forest, IL to Decatur, IL is about 159 miles (255.9 km), with a travel time of about 02h 34m by car.
- The straight-line flight distance is about 137.3 miles (220.9 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 Iroquois County, Illinois, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between Oak Forest and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Oak Forest and Decatur.
-
1
Start on the route
36 m · 11 sec
-
2
Turn uturn onto West 159th Street
2203 ft · 47 sec · West 159th Street
-
3
Turn right onto Cicero Avenue
1 mi · 2 min · Cicero Avenue
-
4
Turn left onto 167th Street
855 ft · 26 sec · 167th Street
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5
Take the ramp slight right toward I 57 South: Kankakee, I-80
3048 ft · 1 min
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6
Merge slight left
110.8 mi · 2 hr
-
7
Take the exit slight right toward I 72 West: Decatur
2596 ft · 1 min
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8
Merge slight left
36.6 mi · 39 min
-
9
Take the exit slight right toward IL 48: Oreana, Decatur
2140 ft · 39 sec
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10
Turn left
5.1 mi · 8 min
-
11
Turn right onto East Eldorado Street
1163 ft · 29 sec · East Eldorado Street
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12
Continue straight
1.4 mi · 2 min
-
13
Turn left onto North Main Street
1985 ft · 49 sec · North Main Street
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14
Turn left onto East Wood Street
91 m · 8 sec · East Wood Street
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15
Arrive at your destination
0 m · 1 sec · East Wood Street
Car Route Details
A richer read on the saved driving route between Oak Forest and Decatur.
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 57 South
Merge slight left
111 mi · 02h 00m
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 Oak Forest and Showers And Thunderstorms Likely near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Oak Forest to Decatur?
The road trip is about 159 miles (255.9 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?
Buckley is a useful midpoint, sitting about 78.8 miles from Oak Forest and 80.2 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 137.3 miles (220.9 km), while the road route adds roughly 21.7 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 $21.16 one way or $42.31 round trip. Estimated CO2 is about 49.9 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms Likely around Oak Forest and Showers And Thunderstorms Likely near Decatur.
Stop Ideas Near Buckley
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 Buckley.
Gilman
Rantoul
Illinois Terminal
Pontiac station
Flight Path Map
This map shows the direct air route between Oak Forest and Decatur. Straight-line distance: 137.29 mi (220.95 km).
#1 Oak Forest
City in Cook County, Illinois
| Population | 26,884 |
| Coordinates | 41.6028100, -87.7439400 |
| Altitude | 205 |
| Country | United States |
#2 Decatur
The most populous city in Macon County, Illinois.
| Population | 70,007 |
| Coordinates | 39.8403100, -88.9548000 |
| Altitude | 205 |
| Country | United States |
End: East Wood Street (-88.954801, 39.840341)
Estimated Travel Time
Distance: 256 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 17m |
| 40 mph (64.37 km/h) | 03h 58m |
| 50 mph (80.47 km/h) | 03h 10m |
| 60 mph (96.56 km/h) | 02h 39m |
| 70 mph (112.65 km/h) | 02h 16m |
| 80 mph (129 km/h) | 01h 59m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $21.16 | $42.31 |
| Mid-grade | $4.25 | $23.86 | $47.72 |
| Premium | $4.65 | $26.11 | $52.22 |
| Diesel | $5.30 | $29.76 | $59.51 |
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 · Apr 24, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.