Origin
Decatur, IL
Evening in Decatur on Tuesday
Local time
7:51 PM
CDT
Current temp
55°F
Unavailable
Live forecast
Trip from Decatur, IL to Marion, IL
Data updated 4 hours ago
Drive Time
3h 11m
Distance
162.9 mi
262 km
Drive Score
9/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$25
one way
EV Charging
Excellent
19 DC fast
Best Time to Leave
4 AM
3h 0m
★
6 AM
3h 12m
8 AM
3h 35m
10 AM
3h 20m
12 PM
3h 18m
3 PM
3h 21m
5 PM
3h 34m
8 PM
3h 5m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Decatur, IL
Wikimedia Commons
Marion, IL
Stéphane Tendon
Trip Overview
The drive from Decatur, IL to Marion, IL covers 162.9 miles and takes about 3h 11m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on Ken Gray Expressway, I 57, South Business Route 51 for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 38.7 miles on Ken Gray Expressway. At current regular gas prices, budget about $25.47 one way before food or hotel costs.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
81.4 miles from Decatur, IL
A natural place for your longest stop of the day , about 1h 40m into the drive .
Loading map...
Drive Character
This is a 3h 11m highway drive covering 162.9 miles, with most of the trip on Ken Gray Expressway and I 57. The longest continuous stretch is about 38.7 miles on Ken Gray Expressway.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 29 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Ken Gray Expressway is the longest continuous segment at about 38.7 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on Ken Gray Expressway and I 57. You will hit about 16 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.1 miles in near US 51 Business / South Main Street.
Route Complexity
5/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
This drive requires moderate attention. Across 162.9 miles you will encounter 16 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 0.1 miles (US 51 Business / South Main Street): Navigation decision point; at 32.8 miles (US 51; IL 16 / North 2600 East Road): Navigation decision point; at 34.4 miles (US 51; IL 16 / East 1st Street): Navigation decision point.
Critical Maneuvers
5 of 16 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
4
0.1 mi into trip
|
~0m in
|
US 51 Business / South Main Street
Turn left onto US 51 Business / South Main Street
Navigation decision point
4
32.8 mi into trip
|
~40m in
|
US 51; IL 16 / North 2600 East Road
Turn right onto US 51; IL 16 / North 2600 East Road
Navigation decision point
4
34.4 mi into trip
|
~44m in
|
US 51; IL 16 / East 1st Street
Turn right onto US 51; IL 16 / East 1st Street
Navigation decision point
4
65.5 mi into trip
|
~1h 22m in
|
US 40; US 51; IL 185 / West Gallatin Street
Turn left onto US 40; US 51; IL 185 / West Gallatin Street
Navigation decision point
4
66 mi into trip
|
~1h 22m in
Turn right
Navigation decision point
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Ken Gray Expressway | 38.7 mi | 41m |
| I 57 | 24.5 mi | 26m |
| South Business Route 51 | 23.4 mi | 29m |
| 300 East Road | 15.1 mi | 17m |
| United States Highway 51 | 13.4 mi | 15m |
| County Road 875 East | 11.1 mi | 12m |
| 250E | 10.4 mi | 11m |
| North 2600 East Rd | 7.9 mi | 9m |
Longest stretch:
Ken Gray Expressway
— 38.7 mi, about 41m
Turn-by-Turn Driving Directions
Step-by-step road directions between Decatur, IL and Marion, IL.
1
Start on East Wood Street
298 ft
·
15 sec
·
East Wood Street
2
Turn left onto US 51 Business
1.4 mi
·
2 min
·
South Main Street
3
Continue on US 51 Business
3.8 mi
·
5 min
·
South Business Route 51
4
Take the ramp onto US 51 Business
20 mi
·
23 min
·
South Business Route 51
5
Continue on US 51
7.9 mi
·
9 min
·
North 2600 East Rd
6
Turn right onto US 51; IL 16
1.0 mi
·
1 min
·
North 2600 East Road
7
Continue on US 51; IL 16
0.5 mi
·
1 min
·
Jackson Street
8
Turn left onto US 51; IL 16
467 ft
·
8 sec
·
Cedar Street
9
Turn right onto US 51; IL 16
0.4 mi
·
1 min
·
East 1st Street
10
Turn left onto US 51; IL 16
0.4 mi
·
29 sec
·
South Poplar Street
11
Turn straight onto US 51
0.6 mi
·
2 min
·
Fair Avenue
12
Continue on US 51
2.0 mi
·
2 min
·
County Road 2400 E
13
Continue on US 51
15 mi
·
17 min
·
300 East Road
14
Continue on US 51
11 mi
·
12 min
·
County Road 875 East
15
Continue on US 51
1.5 mi
·
1 min
·
North Kennedy Boulevard
16
Turn left onto US 40; US 51; IL 185
0.5 mi
·
34 sec
·
West Gallatin Street
17
Turn right
0.1 mi
·
7 sec
18
Continue on US 51
13 mi
·
15 min
·
United States Highway 51
19
Continue on US 51
10 mi
·
11 min
·
250E
20
Turn left onto US 50
7.6 mi
·
8 min
·
US 50
21
Take the exit
0.3 mi
·
45 sec
22
Merge onto I 57
24 mi
·
26 min
·
I 57
23
Keep slight right at fork onto I 57
39 mi
·
41 min
·
Ken Gray Expressway
24
Take the exit
0.4 mi
·
45 sec
Toward Marion
25
Keep slight left at fork
117 ft
·
8 sec
26
Turn left onto West Main Street
1.5 mi
·
2 min
·
West Main Street
27
Turn right
80 ft
·
11 sec
28
Turn left
151 ft
·
11 sec
29
Arrive at destination
Trip Plan
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 81.4 miles from Decatur, IL, or about 1h 40m into the drive.
The longest continuous stretch on this route runs about 38.7 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 80 miles or 1h 38m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 81.4 miles or 1h 40m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 38m
Traffic, exits, and arrival timing usually matter more near Marion, IL than in the middle of the route.
Before You Leave
+
Open the route before leaving Decatur, IL so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Decatur, IL
This is one driving day of about 162.9 miles and 3h 11m.
Your first comfortable stop window is around 80 miles from Decatur, IL.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Ken Gray Expressway for about 38.7 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 81.4 mi from Decatur, IL · 1h 40m into the drive
Mid-route town
Meal stop
81 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 80 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 81.4 miles from Decatur, IL, which is a good place for a longer meal and fuel stop.
Arriving in Marion, IL
The final approach into Marion, IL usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Marion, IL.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$25.47 one way
$50.94 round trip
$3.97/gal
25.4 MPG avg
57 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $27.96 | $55.92 |
| premium | $4.89 | $31.35 | $62.70 |
| diesel | $5.61 | $35.97 | $71.93 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$25
Meals
$25–$50
Total
$50–$75
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 57 kg one way. Prices: EIA weekly data, 2026-04-13.
EV Charging Along Route
19 DC fast chargers · Coverage: excellent
Subway - Tesla Supercharger
Salem, IL
Tesla
12 DCFC
Mach 1 Convenience Store - Tesla Supercharger
Vandalia, IL
Tesla
8 DCFC
Holiday Inn Mt. Vernon - Tesla Supercharger
Mt. Vernon, IL
Tesla
8 DCFC
Mach 1 - Tesla Supercharger
Mt. Vernon, IL
Tesla
8 DCFC
Mach 1 - Tesla Supercharger
Marion, IL
Tesla
8 DCFC
Pilot Travel Center 1219
Vandalia, IL
eVgo Network
4 DCFC
Salem Liquor
Salem, IL
UNIVERSAL
4 DCFC
Pilot Travel Center 482
Mount Vernon, IL
eVgo Network
4 DCFC
ChargePoint Network: 6
Tesla: 5
eVgo Network: 3
UNIVERSAL: 2
Electrify America: 1
CIRCLE_K: 1
SYNERGEV: 1
Station data from NREL Alternative Fuel Stations database.
Driving Electric?
About $17 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 48.9 | 0 | $17.10 | $7.82 |
| Efficient EV | 40.7 | 0 | $14.25 | $6.52 |
| EV Truck/SUV | 65.2 | 0 | $22.81 | $10.43 |
Gas CO2
57 kg
EV CO2
19 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Destination
Marion, IL
Evening in Marion on Tuesday
Local time
7:51 PM
CDT
Current temp
46°F
Unavailable
Live forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
9 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
3h 11m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Decatur, IL to Marion, IL covers 162.9 miles and takes about 3h 11m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Ken Gray Expressway, I 57, South Business Route 51. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 81.4 miles from Decatur, IL. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $25.47 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
Plan about 1 meaningful break for fuel, food, or rest. A short stop every 2 to 3 hours is enough for this drive.
This drive requires moderate attention. Across 162.9 miles you will encounter 16 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
The main spots that need attention: at 0.1 miles (US 51 Business / South Main Street): Navigation decision point; at 32.8 miles (US 51; IL 16 / North 2600 East Road): Navigation decision point; at 34.4 miles (US 51; IL 16 / East 1st Street): Navigation decision point.
The route from Decatur, IL to Marion, IL does not surface many named destination signs beyond the main corridor.
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