How far is St. Charles, IL from Decatur, IL?
The driving distance from St. Charles, IL to Decatur, IL is about 194.7 miles (313.3 km), with a travel time of about 03h 16m by car.
- The straight-line flight distance is about 147.2 miles (236.9 km).
- For a round trip, plan for roughly 06h 32m 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 03h 16m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
Township in Livingston County, Illinois
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Slight Chance Showers And Thunderstorms then Mostly Sunny
Driving Route Map
The map below follows the saved road route between St. Charles and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between St. Charles and Decatur.
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1
Start on South 5th Avenue
2350 ft · 56 sec · South 5th Avenue
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2
Turn sharp right onto South Riverside Avenue
701 ft · 22 sec · South Riverside Avenue
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3
Turn left onto Prairie Street
1.7 mi · 4 min · Prairie Street
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4
Turn left onto South Randall Road
676 ft · 22 sec · South Randall Road
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5
Continue on Randall Road
2.6 mi · 5 min · Randall Road
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6
Continue on North Randall Road
3.3 mi · 5 min · North Randall Road
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7
Turn right onto Orchard Road
11.2 mi · 19 min · Orchard Road
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8
Continue on Minkler Road
1.5 km · 2 min · Minkler Road
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9
Enter the roundabout and take exit 1 toward Minkler Road
39 m · 4 sec · Minkler Road
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10
Exit the roundabout onto Minkler Road
3.4 mi · 5 min · Minkler Road
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11
At the end of the road, turn right onto East Schoolhouse Road
2391 ft · 47 sec · East Schoolhouse Road
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12
Turn left onto Ashley Road
3.8 mi · 5 min · Ashley Road
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13
Turn right onto Caton Farm Road
1.5 mi · 2 min · Caton Farm Road
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14
Turn left
7.2 mi · 10 min
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15
Continue on North Bridge Street
1.3 mi · 2 min · North Bridge Street
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16
Continue straight
22.1 mi · 26 min
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17
Take the exit right toward I 55 South: Bloomington
1864 ft · 46 sec
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18
Merge slight left
62.4 mi · 1 hr 7 min
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19
Keep slight left to continue on I 74 East, US 51 South, US 55 Business North: Indianapolis, Decatur
2.1 mi · 2 min
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20
Take the exit slight right toward US 51 South, US 51 Business North: Decatur, Bloomington
1616 ft · 40 sec
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21
Continue on North 1450 East Road
14.7 mi · 18 min · North 1450 East Road
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22
Continue on North Walnut Street
23.2 mi · 30 min · North Walnut Street
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23
Turn straight
4.7 mi · 8 min
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24
Turn left onto East Wood Street
91 m · 8 sec · East Wood Street
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25
Arrive at your destination
0 m · 1 sec · East Wood Street
Car Route Details
A richer read on the saved driving route between St. Charles and Decatur.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
I 55 South
Merge slight left
62.4 mi · 01h 07m
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 St. Charles and Slight Chance Showers And Thunderstorms then Mostly Sunny near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from St. Charles to Decatur?
The road trip is about 194.7 miles (313.3 km) and usually takes 03h 16m 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?
Rooks Creek is a useful midpoint, sitting about 83.9 miles from St. Charles and 110.8 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 147.2 miles (236.9 km), while the road route adds roughly 47.5 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 10:28 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $25.91 one way or $51.81 round trip. Estimated CO2 is about 61.1 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around St. Charles and Slight Chance Showers And Thunderstorms then Mostly Sunny near Decatur.
Stop Ideas Near Rooks Creek
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 Rooks Creek.
Pontiac station
Dwight station
Uptown Station
Gilman
Flight Path Map
This map shows the direct air route between St. Charles and Decatur. Straight-line distance: 147.21 mi (236.91 km).
#1 St. Charles
Chicago suburb in Kane and DuPage counties of Illinois, United States
| Population | 32,974 |
| Coordinates | 41.9141900, -88.3086900 |
| Altitude | 223 |
| 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: 313 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 29m |
| 40 mph (64.37 km/h) | 04h 52m |
| 50 mph (80.47 km/h) | 03h 53m |
| 60 mph (96.56 km/h) | 03h 14m |
| 70 mph (112.65 km/h) | 02h 46m |
| 80 mph (129 km/h) | 02h 25m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $25.91 | $51.81 |
| Mid-grade | $4.25 | $29.22 | $58.44 |
| Premium | $4.65 | $31.97 | $63.95 |
| Diesel | $5.30 | $36.44 | $72.88 |
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.