How far is Decatur, IL from Mattoon, IL?
The driving distance from Decatur, IL to Mattoon, IL is about 45.2 miles (72.7 km), with a travel time of about 01h 08m by car.
- The straight-line flight distance is about 39.6 miles (63.7 km).
- For a round trip, plan for roughly 02h 16m 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 01h 08m.
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.
Village in 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 Decatur and Mattoon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Decatur and Mattoon.
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1
Start on East Wood Street
155 m · 23 sec · East Wood Street
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2
Turn left onto South Franklin Street
1982 ft · 45 sec · South Franklin Street
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3
Turn right onto West Eldorado Street
1.2 mi · 2 min · West Eldorado Street
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4
Turn slight right
3.3 mi · 5 min
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5
Continue on South Mount Zion Road
2.1 mi · 3 min · South Mount Zion Road
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6
Continue on North State Route 121
35.3 mi · 51 min · North State Route 121
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7
Continue on Dewitt Avenue
2.3 mi · 4 min · Dewitt Avenue
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8
Turn right onto North 15th Street
2104 ft · 2 min · North 15th Street
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9
Turn right
35 m · 9 sec
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10
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Decatur and Mattoon.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
North State Route 121
Continue on North State Route 121
35.3 mi · 00h 51m
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 Decatur and Sunny near Mattoon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Decatur to Mattoon?
The road trip is about 45.2 miles (72.7 km) and usually takes 01h 08m 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?
Bethany is a useful midpoint, sitting about 22.6 miles from Decatur and 22.6 miles from Mattoon.
How much longer is the road route than the straight-line distance?
The direct path is about 39.6 miles (63.7 km), while the road route adds roughly 5.6 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 4:14 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $6.00 one way or $11.99 round trip. Estimated CO2 is about 14.1 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Decatur and Sunny near Mattoon.
Stop Ideas Near Bethany
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 Bethany.
Mattoon station
Effingham
Illinois Terminal
Lincoln
Flight Path Map
This map shows the direct air route between Decatur and Mattoon. Straight-line distance: 39.59 mi (63.71 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 Mattoon
City in Illinois
| Population | 17,513 |
| Coordinates | 39.4830900, -88.3728300 |
| Altitude | 224 |
| Country | United States |
End: Mattoon (-88.37283, 39.48309)
Estimated Travel Time
Distance: 73 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 30m |
| 40 mph (64.37 km/h) | 01h 07m |
| 50 mph (80.47 km/h) | 00h 54m |
| 60 mph (96.56 km/h) | 00h 45m |
| 70 mph (112.65 km/h) | 00h 38m |
| 80 mph (129 km/h) | 00h 33m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $6.00 | $11.99 |
| Mid-grade | $4.25 | $6.76 | $13.52 |
| Premium | $4.65 | $7.40 | $14.80 |
| Diesel | $5.30 | $8.43 | $16.87 |
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.