How far is Lemont, IL from Decatur, IL?
The driving distance from Lemont, IL to Decatur, IL is about 162.3 miles (261.2 km), with a travel time of about 02h 41m by car.
- The straight-line flight distance is about 136.1 miles (219.1 km).
- For a round trip, plan for roughly 05h 23m 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 41m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 Livingston County, Illinois
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Lemont and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Lemont and Decatur.
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1
Start on West New Avenue
147 m · 15 sec · West New Avenue
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2
Turn left onto Lockport Street
42 m · 2 sec · Lockport Street
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3
Turn slight left onto East Illinois Street
149 m · 15 sec · East Illinois Street
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4
Turn left onto State Street
966 ft · 23 sec · State Street
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5
Continue on Lemont Road
3 mi · 5 min · Lemont Road
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6
Take the ramp slight right toward I 55 South
1037 ft · 25 sec
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7
Merge slight left onto Adlai Stevenson Expressway
113.6 mi · 2 hr 5 min · Adlai Stevenson Expressway
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8
Keep slight left to continue on I 74 East, US 51 South, US 55 Business North: Indianapolis, Decatur
2.1 mi · 2 min
-
9
Take the exit slight right toward US 51 South, US 51 Business North: Decatur, Bloomington
1616 ft · 40 sec
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10
Continue on North 1450 East Road
14.7 mi · 18 min · North 1450 East Road
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11
Continue on North Walnut Street
23.2 mi · 30 min · North Walnut Street
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12
Turn straight
4.7 mi · 8 min
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13
Turn left onto East Wood Street
91 m · 8 sec · East Wood Street
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14
Arrive at your destination
0 m · 1 sec · East Wood Street
Car Route Details
A richer read on the saved driving route between Lemont and Decatur.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Adlai Stevenson Expressway
Merge slight left onto Adlai Stevenson Expressway
114 mi · 02h 05m
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.
Mostly Sunny leaving Lemont and Sunny near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Lemont to Decatur?
The road trip is about 162.3 miles (261.2 km) and usually takes 02h 41m 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?
Rooks Creek is a useful midpoint, sitting about 81.1 miles from Lemont and 81.3 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 136.1 miles (219.1 km), while the road route adds roughly 26.2 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 1:06 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $21.61 one way or $43.22 round trip. Estimated CO2 is about 50.9 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Lemont and Sunny near Decatur.
Stop Ideas Near Rooks Creek
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 Rooks Creek.
Pontiac station
Dwight station
Uptown Station
Gilman
Flight Path Map
This map shows the direct air route between Lemont and Decatur. Straight-line distance: 136.14 mi (219.09 km).
#1 Lemont
Historic village in the U.
| Population | 17,338 |
| Coordinates | 41.6736400, -88.0017300 |
| Altitude | 185 |
| 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: 261 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 24m |
| 40 mph (64.37 km/h) | 04h 03m |
| 50 mph (80.47 km/h) | 03h 14m |
| 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 | $21.61 | $43.22 |
| Mid-grade | $4.25 | $24.37 | $48.74 |
| Premium | $4.65 | $26.67 | $53.33 |
| Diesel | $5.30 | $30.39 | $60.78 |
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.