Origin
Decatur, IL
Late night in Decatur on Saturday
Local time
12:58 AM
CDT
Current temp
74°F
Unavailable
Live forecast
Trip from Decatur, IL to Mount Vernon, IL
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
2h 28m
Distance
122.4 mi
197 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$19
one way
EV Charging
Unknown
Best Time to Leave
4 AM
2h 19m
★
6 AM
2h 29m
8 AM
2h 49m
10 AM
2h 36m
12 PM
2h 34m
3 PM
2h 37m
5 PM
2h 48m
8 PM
2h 23m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Decatur, IL
Wikimedia Commons
Mount Vernon, IL
Michaela Schmidt
Trip Overview
The drive from Decatur, IL to Mount Vernon, IL covers 122.4 miles and takes about 2h 28m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on South Main Street, Route 51, North 2600 East Rd for much of the mileage, and the overall profile is turn-heavy local drive. At current regular gas prices, budget about $19.14 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.
Midpoint
61.2 miles from Decatur, IL
A natural place for your longest stop of the day , about 1h 14m into the drive .
About the Cities
Starting in Decatur, IL
Full guide →Decatur is a city in Macon county, Illinois. There are many examples of Frank Lloyd Wright's influence on the Prairie Style Architecture in Decatur.
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 2h 28m. Total distance: 122.4 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
2h 28m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (0%). Straightforward navigation.
Scenic Drive
Turn-heavy local drive route profile.
Drive Character
Expect a 2h 28m drive with frequent turns across 122.4 miles of local and secondary roads.
This route has more turning and local-road decision points than a simple highway run.
There are about 25 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
South Main Street is one of the defining roads on this drive.
How Hard Is This Drive?
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. Navigation is very simple - set it and forget it for most of the drive.
Driving Effort
1/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Decatur, IL to Mount Vernon, IL is easy. At 2h 28m with 0% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
This route does not have any notably tricky sections. Most of the drive from Decatur, IL to Mount Vernon, IL is straightforward, with well-signed roads and simple exits.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| South Main Street | — | — |
| Route 51 | — | — |
| North 2600 East Rd | — | — |
| North 2600 East Road | — | — |
| Jackson Street | — | — |
| Cedar Street | — | — |
| East 1st Street | — | — |
| South Poplar Street | — | — |
Some road-level metrics are being recalculated.
Longest stretch:
South Main Street
— detailed segment metrics are refreshing.
Turn-by-Turn Driving Directions
Step-by-step road directions between Decatur, IL and Mount Vernon, IL.
1
Start on East Wood Street
299 ft
·
16 sec
·
East Wood Street
2
Turn left onto South Main Street
1.4 mi
·
2 min
·
South Main Street
3
Continue on South Business Route 51
3.8 mi
·
5 min
·
South Business Route 51
4
Take the ramp straight toward South Business Route 51
20 mi
·
23 min
·
South Business Route 51
5
Continue on North 2600 East Rd
7.9 mi
·
9 min
·
North 2600 East Rd
6
Turn right onto North 2600 East Road
1.0 mi
·
1 min
·
North 2600 East Road
7
Continue on Jackson Street
0.5 mi
·
1 min
·
Jackson Street
8
Turn left onto Cedar Street
466 ft
·
8 sec
·
Cedar Street
9
Turn right onto East 1st Street
0.4 mi
·
1 min
·
East 1st Street
10
Turn left onto South Poplar Street
0.4 mi
·
30 sec
·
South Poplar Street
11
Turn straight onto Fair Avenue
0.6 mi
·
2 min
·
Fair Avenue
12
Continue on County Road 2400 E
2.0 mi
·
2 min
·
County Road 2400 E
13
Continue on 300 East Road
15 mi
·
17 min
·
300 East Road
14
Continue on County Road 875 East
11 mi
·
12 min
·
County Road 875 East
15
Continue on North Kennedy Boulevard
1.5 mi
·
1 min
·
North Kennedy Boulevard
16
Turn left onto West Gallatin Street
0.5 mi
·
34 sec
·
West Gallatin Street
17
Turn right
0.1 mi
·
7 sec
18
Continue on United States Highway 51
13 mi
·
15 min
·
United States Highway 51
19
Continue on 250E
10 mi
·
11 min
·
250E
20
Turn left
7.6 mi
·
8 min
21
Take the exit left
0.3 mi
·
45 sec
22
Merge slight left
21 mi
·
23 min
23
Take the exit slight right toward IL 15: Ashley, Mt. Vernon
0.3 mi
·
42 sec
·
IL 15: Ashley, Mt. Vernon
24
Turn straight onto Broadway Street
2.8 mi
·
5 min
·
Broadway Street
25
Arrive at your destination
Trip Plan
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
You can normally do this drive in one day.
You may only need one short stretch break if traffic stays light.
The halfway point lands around 61.2 miles from Decatur, IL, or about 1h 14m into the drive.
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 27 miles or 32m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 61.2 miles or 1h 14m 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 2m
Traffic, exits, and arrival timing usually matter more near Mount Vernon, 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 122.4 miles and 2h 28m.
Your first comfortable stop window is around 27 miles from Decatur, IL.
This route can stay practical as a one-day drive if traffic stays reasonable.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 61.2 mi from Decatur, IL · 1h 14m into the drive
Mid-route town
Meal stop
61 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 27 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 61.2 miles from Decatur, IL, which is a good place for a longer meal and fuel stop.
Arriving in Mount Vernon, IL
The final approach into Mount Vernon, 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 Mount Vernon, 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
$19.14 one way
$38.27 round trip
$3.97/gal
25.4 MPG avg
43 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $21.01 | $42.02 |
| premium | $4.89 | $23.55 | $47.11 |
| diesel | $5.61 | $27.02 | $54.05 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$19
Meals
$25–$50
Total
$44–$69
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 42.8 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $13 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 36.7 | 0 | $12.85 | $5.88 |
| Efficient EV | 30.6 | 0 | $10.71 | $4.90 |
| EV Truck/SUV | 49 | 0 | $17.14 | $7.83 |
Gas CO2
43 kg
EV CO2
14 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
Mount Vernon, IL
Late night in Mount Vernon on Saturday
Local time
12:58 AM
CDT
Current temp
56°F
Unavailable
Live forecast
54°F
Vandalia, IL
61 mi in
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
18 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
2h 28m 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 Mount Vernon, IL covers 122.4 miles and takes about 2h 28m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are South Main Street, Route 51, North 2600 East Rd. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 61.2 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 $19.14 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
The drive from Decatur, IL to Mount Vernon, IL is easy. At 2h 28m with 0% highway, most drivers will find it relaxed and low-stress.
This route does not have any notably tricky sections. Most of the drive from Decatur, IL to Mount Vernon, IL is straightforward, with well-signed roads and simple exits.
The route from Decatur, IL to Mount Vernon, IL does not surface many named destination signs beyond the main corridor.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
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