How far is Marion, IL from Decatur, IL?
The driving distance from Marion, IL to Decatur, IL is about 163.3 miles (262.8 km), with a travel time of about 02h 57m by car.
- The straight-line flight distance is about 145.8 miles (234.6 km).
- For a round trip, plan for roughly 05h 54m 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 57m.
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.
Township in Marion County, Illinois
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 Marion and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Marion and Decatur.
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1
Start on the route
46 m · 13 sec
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2
Turn right
24 m · 11 sec
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3
Turn left onto West Main Street
1.3 mi · 2 min · West Main Street
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4
Take the ramp right
2011 ft · 49 sec
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5
Merge slight left onto Ken Gray Expressway
42.7 mi · 46 min · Ken Gray Expressway
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6
Keep slight right to continue on Ken Gray Expressway
20.5 mi · 22 min · Ken Gray Expressway
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7
Take the exit slight right toward US 50: Salem, Sandoval
2199 ft · 54 sec
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8
Merge slight left onto West Main Street
2.4 mi · 3 min · West Main Street
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9
Continue on East Poplar Street
2.7 mi · 3 min · East Poplar Street
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10
Continue on Poplar
2.7 mi · 3 min · Poplar
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11
Turn right onto 150E
10.4 mi · 12 min · 150E
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12
Continue on 300E
13.5 mi · 15 min · 300E
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13
Turn left
2405 ft · 35 sec
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14
Turn right onto North Kennedy Boulevard
1.6 mi · 2 min · North Kennedy Boulevard
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15
Continue on County Road 875 East
11.1 mi · 13 min · County Road 875 East
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16
Continue on South Superior Street
15.1 mi · 17 min · South Superior Street
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17
Continue on County Road 2400 East
2 mi · 3 min · County Road 2400 East
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18
Continue on Fair Avenue
3070 ft · 2 min · Fair Avenue
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19
Continue on South Poplar Street
2138 ft · 32 sec · South Poplar Street
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20
Turn right onto East 1st Street
2150 ft · 1 min · East 1st Street
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21
Turn left onto Cedar Street
116 m · 5 sec · Cedar Street
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22
Turn right onto Jackson Street
2709 ft · 2 min · Jackson Street
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23
Continue on North 2600 East Road
1.6 km · 2 min · North 2600 East Road
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24
Turn left
28.7 mi · 33 min
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25
Take the exit slight right toward Decatur
2582 ft · 1 min
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26
Keep slight right to continue on Decatur
44 m · 4 sec
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27
Turn straight onto South Business Route 51
2.6 mi · 4 min · South Business Route 51
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28
Continue on South Main Street
769 ft · 19 sec · South Main Street
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29
Continue on South Franklin Street
1.2 mi · 2 min · South Franklin Street
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30
Turn left onto East Wood Street
155 m · 16 sec · East Wood Street
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31
Arrive at your destination
0 m · 1 sec · East Wood Street
Car Route Details
A richer read on the saved driving route between Marion and Decatur.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Ken Gray Expressway
Merge slight left onto Ken Gray Expressway
42.7 mi · 00h 46m
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 Marion and Sunny near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Marion to Decatur?
The road trip is about 163.3 miles (262.8 km) and usually takes 02h 57m 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?
Patoka is a useful midpoint, sitting about 81.8 miles from Marion and 81.5 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 145.8 miles (234.6 km), while the road route adds roughly 17.5 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 12:36 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $21.72 one way or $43.44 round trip. Estimated CO2 is about 51.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Marion and Sunny near Decatur.
Stop Ideas Near Patoka
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 Patoka.
Centralia station
Mt. Vernon, IL
Effingham
Du Quoin
Flight Path Map
This map shows the direct air route between Marion and Decatur. Straight-line distance: 145.77 mi (234.6 km).
#1 Marion
City in and the county seat of Williamson County, Illinois, United States
| Population | 17,803 |
| Coordinates | 37.7306100, -88.9331300 |
| Altitude | 129 |
| 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: 263 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 26m |
| 40 mph (64.37 km/h) | 04h 04m |
| 50 mph (80.47 km/h) | 03h 15m |
| 60 mph (96.56 km/h) | 02h 43m |
| 70 mph (112.65 km/h) | 02h 19m |
| 80 mph (129 km/h) | 02h 02m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $21.72 | $43.44 |
| Mid-grade | $4.25 | $24.50 | $48.99 |
| Premium | $4.65 | $26.81 | $53.61 |
| Diesel | $5.30 | $30.55 | $61.10 |
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.