How far is Decatur, IL from Algonquin, IL?
The driving distance from Decatur, IL to Algonquin, IL is about 186.3 miles (299.8 km), with a travel time of about 04h 02m by car.
- The straight-line flight distance is about 164.3 miles (264.4 km).
- For a round trip, plan for roughly 08h 04m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 04h 02m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Township in Livingston County, Illinois
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Decatur and Algonquin.
Turn-by-Turn Driving Directions
Step-by-step road directions between Decatur and Algonquin.
-
1
Start on East Wood Street
155 m · 23 sec · East Wood Street
-
2
Turn left onto South Franklin Street
2129 ft · 46 sec · South Franklin Street
-
3
Continue on North Water Street
27.4 mi · 37 min · North Water Street
-
4
Continue on North 1450 East Road
14.7 mi · 18 min · North 1450 East Road
-
5
Take the exit slight right toward I 74 West, US 51 North: Peoria, Rockford
64.9 mi · 1 hr 10 min
-
6
Take the exit slight right toward IL 47: Morris, Dwight
1853 ft · 35 sec
-
7
Turn left
32 mi · 39 min
-
8
Turn right onto Walker Road
1.5 mi · 2 min · Walker Road
-
9
Turn left onto Ashley Road
2.8 mi · 4 min · Ashley Road
-
10
At the end of the road, turn right onto East Schoolhouse Road
2391 ft · 46 sec · East Schoolhouse Road
-
11
Turn left onto Minkler Road
3.4 mi · 5 min · Minkler Road
-
12
Enter the roundabout and take exit 2 toward Minkler Road
38 m · 4 sec · Minkler Road
-
13
Exit the roundabout onto Minkler Road
1.5 km · 2 min · Minkler Road
-
14
Continue on Orchard Road
11.2 mi · 19 min · Orchard Road
-
15
Turn left onto South Randall Road
23.4 mi · 39 min · South Randall Road
-
16
Turn right onto North County Line Road
1.6 km · 2 min · North County Line Road
-
17
At the end of the road, turn left onto Hanson Road
1284 ft · 31 sec · Hanson Road
-
18
Turn right onto Edgewood Road
1.6 km · 2 min · Edgewood Road
-
19
Turn left onto South Main Street
2267 ft · 58 sec · South Main Street
-
20
Turn right onto South Main Street
669 ft · 32 sec · South Main Street
-
21
Turn left onto Washington Street
24 m · 3 sec · Washington Street
-
22
Arrive at your destination
0 m · 1 sec · Washington Street
Car Route Details
A richer read on the saved driving route between Decatur and Algonquin.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
I 74 West
Take the exit slight right toward I 74 West, US 51 North: Peoria, Rockford
64.9 mi · 01h 10m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Sunny leaving Decatur and Mostly Sunny near Algonquin.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Decatur to Algonquin?
The road trip is about 186.3 miles (299.8 km) and usually takes 04h 02m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Odell is a useful midpoint, sitting about 93.2 miles from Decatur and 93.1 miles from Algonquin.
How much longer is the road route than the straight-line distance?
The direct path is about 164.3 miles (264.4 km), while the road route adds roughly 22 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 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 8:56 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $24.81 one way or $49.63 round trip. Estimated CO2 is about 58.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Decatur and Mostly Sunny near Algonquin.
Stop Ideas Near Odell
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 Odell.
Dwight station
Pontiac station
Gilman
Kankakee
Flight Path Map
This map shows the direct air route between Decatur and Algonquin. Straight-line distance: 164.31 mi (264.43 km).
#1 Decatur
The most populous city in Macon County, Illinois.
| Population | 70,007 |
| Coordinates | 39.8403100, -88.9548000 |
| Altitude | 205 |
| Country | United States |
#2 Algonquin
Village in Illinois
| Population | 30,730 |
| Coordinates | 42.1655800, -88.2942500 |
| Altitude | 226 |
| Country | United States |
End: Algonquin (-88.29425, 42.16558)
Estimated Travel Time
Distance: 300 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 12m |
| 40 mph (64.37 km/h) | 04h 39m |
| 50 mph (80.47 km/h) | 03h 43m |
| 60 mph (96.56 km/h) | 03h 06m |
| 70 mph (112.65 km/h) | 02h 39m |
| 80 mph (129 km/h) | 02h 19m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $24.81 | $49.63 |
| Mid-grade | $4.25 | $27.98 | $55.97 |
| Premium | $4.65 | $30.62 | $61.25 |
| Diesel | $5.30 | $34.90 | $69.80 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.