How far is Decatur, IL from Marion, IL?
The driving distance from Decatur, IL to Marion, IL is about 162.9 miles (262.1 km), with a travel time of about 03h 11m by car.
- The straight-line flight distance is about 145.8 miles (234.6 km).
- For a round trip, plan for roughly 06h 23m 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 11m.
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 Marion County, Illinois
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Decatur and Marion.
Turn-by-Turn Driving Directions
Step-by-step road directions between Decatur and Marion.
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1
Start on East Wood Street
91 m · 16 sec · East Wood Street
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2
Turn left onto South Main Street
1.4 mi · 2 min · South Main Street
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3
Continue on South Business Route 51
3.8 mi · 6 min · South Business Route 51
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4
Take the ramp straight toward South Business Route 51
19.6 mi · 24 min · South Business Route 51
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5
Continue on North 2600 East Rd
7.9 mi · 9 min · North 2600 East Rd
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6
Turn right onto North 2600 East Road
1.6 km · 2 min · North 2600 East Road
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7
Continue on Jackson Street
2668 ft · 2 min · Jackson Street
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8
Turn left onto Cedar Street
142 m · 8 sec · Cedar Street
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9
Turn right onto East 1st Street
2150 ft · 1 min · East 1st Street
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10
Turn left onto South Poplar Street
2138 ft · 30 sec · South Poplar Street
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11
Turn straight onto Fair Avenue
3070 ft · 2 min · Fair Avenue
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12
Continue on County Road 2400 E
2 mi · 3 min · County Road 2400 E
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13
Continue on 300 East Road
15.1 mi · 17 min · 300 East Road
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14
Continue on County Road 875 East
11.1 mi · 13 min · County Road 875 East
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15
Continue on North Kennedy Boulevard
1.5 mi · 2 min · North Kennedy Boulevard
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16
Turn left onto West Gallatin Street
2405 ft · 34 sec · West Gallatin Street
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17
Turn right
554 ft · 7 sec
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18
Continue on United States Highway 51
13.4 mi · 15 min · United States Highway 51
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19
Continue on 250E
10.4 mi · 12 min · 250E
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20
Turn left
7.6 mi · 9 min
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21
Take the exit left
1847 ft · 45 sec
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22
Merge slight left
24.5 mi · 27 min
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23
Keep slight right to continue on Ken Gray Expressway
38.7 mi · 42 min · Ken Gray Expressway
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24
Take the exit slight right toward Marion
1879 ft · 46 sec
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25
Keep slight left
36 m · 8 sec
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26
Turn left onto West Main Street
1.5 mi · 3 min · West Main Street
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27
Turn right
24 m · 11 sec
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28
Turn left
46 m · 11 sec
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29
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Decatur and Marion.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Ken Gray Expressway
Keep slight right to continue on Ken Gray Expressway
38.7 mi · 00h 42m
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 Sunny near Marion.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Decatur to Marion?
The road trip is about 162.9 miles (262.1 km) and usually takes 03h 11m 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?
Patoka is a useful midpoint, sitting about 81.5 miles from Decatur and 81.3 miles from Marion.
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 17.1 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 10:36 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $21.68 one way or $43.37 round trip. Estimated CO2 is about 51.1 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Decatur and Sunny near Marion.
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 Decatur and Marion. Straight-line distance: 145.77 mi (234.6 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 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 |
End: Marion (-88.93313, 37.73061)
Estimated Travel Time
Distance: 262 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 25m |
| 40 mph (64.37 km/h) | 04h 04m |
| 50 mph (80.47 km/h) | 03h 15m |
| 60 mph (96.56 km/h) | 02h 42m |
| 70 mph (112.65 km/h) | 02h 19m |
| 80 mph (129 km/h) | 02h 01m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $21.68 | $43.37 |
| Mid-grade | $4.25 | $24.45 | $48.91 |
| Premium | $4.65 | $26.76 | $53.52 |
| Diesel | $5.30 | $30.50 | $61.00 |
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.