This 164.9-mile drive from Westmont, IL, to Decatur, IL, is easily manageable as a single-day trip, taking approximately 3 hours and 14 minutes. You'll be spending about 74% of your time on highways, making it a fairly direct journey through the Midwest. With an estimated fuel cost of $26, this route offers an economical way to travel between these two Illinois locations. The drive is straightforward, ideal for those looking for a practical and efficient transit rather than a leisurely exploration. Consider this a solid option if you need to get from Point A to Point B without much fuss.
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
82.5 miles from Westmont, IL
A natural place for your longest stop of the day
, about 1h 35m into the drive
.
Expect a highway-focused experience for most of this 164.9-mile trip. You'll be on the Adlai Stevenson Expressway for a significant portion, including the longest uninterrupted stretch of 115.3 miles. While the majority of your drive involves higher speeds and direct travel, the route also incorporates local roads like North Walnut Street and North 1450 East Road, offering a slight shift in pace as you approach your destination. This blend means you'll get the efficiency of highway travel with a touch of local road feel towards the end.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 11 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Adlai Stevenson Expressway is the longest continuous segment at about 115.3 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on Adlai Stevenson Expressway and North Walnut Street. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near North Cass Avenue.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 3h 14m drive. You will face about 6 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: near the start (North Cass Avenue): Lane positioning matters here; at 4.3 miles: Navigation decision point; at 4.7 miles (I 55 / Adlai Stevenson Expressway): Merge point - match speed before joining. Lane positioning matters here.
Critical Maneuvers
5 of 6 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
5
0 mi into trip|~0m in|North Cass Avenue
Turn right onto North Cass Avenue
Lane positioning matters here
Use the left lane.
3
4.3 mi into trip|~8m in
Take the ramp toward I 55 South
Navigation decision point
Toward I 55 South
5
4.7 mi into trip|~9m in|I 55 / Adlai Stevenson Expressway
Merge onto I 55 / Adlai Stevenson Expressway
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
6
120 mi into trip|~2h 16m in|I 74; US 51
Keep slight left at fork onto I 74; US 51 toward I 74 East, US 51 South, US 55 Business North: Indianapolis, Decatur
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward I 74 East, US 51 South, US 55 Business N...
6
122.1 mi into trip|~2h 19m in|US 51
Take the exit onto US 51 toward US 51 South, US 51 Business North: Decatur, Bloomington
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 135
Toward US 51 South, US 51 Business North: Decat...
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Westmont, IL to Decatur, IL, road signs begin pointing toward Bloomington along the way.
Step-by-step road directions between Westmont, IL and Decatur, IL.
1
Start on West Burlington Avenue
78 ft·7 sec·West Burlington Avenue
2
Turn right onto North Cass Avenue
4.2 mi·8 min·North Cass Avenue
Use the left lane.
3
Take the ramp
0.4 mi·53 sec
Toward I 55 South
4
Merge onto I 55
115 mi·2 hr 7 min·Adlai Stevenson Expressway
Use the straight / slight right lanes.
5
Keep slight left at fork onto I 74; US 51
2.1 mi·2 min·I 74; US 51
Toward I 74 East, US 51 South, US 55 Business North: Indianapolis, Decatur
6
Take the exit onto US 51
0.3 mi·39 sec·US 51
Exit 135Toward US 51 South, US 51 Business North: Decatur, Bloomington
7
Continue on US 51
15 mi·17 min·North 1450 East Road
Use the straight lane.
8
Continue on US 51
23 mi·29 min·North Walnut Street
9
Turn straight onto US 51 Business
4.7 mi·7 min·US 51 Business
10
Turn left onto East Wood Street
298 ft·8 sec·East Wood Street
11
Arrive at destination
East Wood Street
Trip Plan
Given the 3-hour, 14-minute duration, leaving Westmont in the morning is a good strategy to make the most of your day in Decatur. You won't necessarily need a planned stop, but keep an eye on your fuel gauge, especially before embarking on the 115.3-mile stretch on the Adlai Stevenson Expressway. The $26 fuel cost is a reasonable estimate, but it’s always wise to have a little extra budgeted. Since this is a single-day drive, you have flexibility; aim to depart when traffic is lightest to maximize your time on the road.
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 82.5 miles from Westmont, IL, or about 1h 35m into the drive.
The longest continuous stretch on this route runs about 115.3 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 36 miles or 43m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 82.5 miles or 1h 35m 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 35m
Traffic, exits, and arrival timing usually matter more near Decatur, IL than in the middle of the route.
Before You Leave
+
Open the route before leaving Westmont, 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 Westmont, IL
This is one driving day of about 164.9 miles and 3h 14m.
Your first comfortable stop window is around 36 miles from Westmont, 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 Adlai Stevenson Expressway for about 115.3 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 82.5 mi from Westmont, IL
· 1h 35m into the drive
Place data sourced from public business listings. Hours and availability may vary.
National Parks Near This Route
Worth a detour if your schedule allows.
Pullman National Historical Park
National Historical Park
In a growing Chicago neighborhood, diverse people and stories intertwined. All were seeking opportunity. Some succeeded. Others were limited—by race, gender, or economic status. Their stories came tog...
20 mi from route
~50 min detour
Free
near mile 5.7
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$25.78 one way
$51.56 round trip
$3.97/gal25.4 MPG avg58 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$28.31
$56.61
premium
$4.89
$31.73
$63.47
diesel
$5.61
$36.41
$72.82
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$26
Meals
$25–$50
Total
$51–$76
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 57.7 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $17 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
49.5
0
$17.31
$7.92
Efficient EV
41.2
0
$14.43
$6.60
EV Truck/SUV
66
0
$23.09
$10.55
Gas CO2
58 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.
Forecast as of Apr 14, 2026
Origin
Westmont, IL
Late night
in Westmont on Saturday
Local time
3:17 AM
CDT
Current temp
67°F
Unavailable
Live forecast
Destination
Decatur, IL
Late night
in Decatur on Saturday
Local time
3:17 AM
CDT
Current temp
85°F
Chance Showers And Thunderstorms
SSW 18 mph27% chanceLive forecast
74°F
El Paso, IL
82 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 warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
3h 14m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Westmont, IL to Decatur, IL covers 164.9 miles and takes about 3h 14m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Adlai Stevenson Expressway, North Walnut Street, North 1450 East Road. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 82.5 miles from Westmont, IL. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $25.78 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 is a straightforward 3h 14m drive. You will face about 6 decision points, but nothing that requires special attention if you follow navigation.
The main spots that need attention: near the start (North Cass Avenue): Lane positioning matters here; at 4.3 miles: Navigation decision point; at 4.7 miles (I 55 / Adlai Stevenson Expressway): Merge point - match speed before joining. Lane positioning matters here.
On the drive from Westmont, IL to Decatur, IL, road signs begin pointing toward Bloomington along the way.
Yes. Nearby national parks include Pullman National Historical Park.
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, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
