How far is Round Lake Beach, IL from Decatur, IL?
The driving distance from Round Lake Beach, IL to Decatur, IL is about 211.3 miles (340 km), with a travel time of about 03h 43m by car.
- The straight-line flight distance is about 180.6 miles (290.6 km).
- For a round trip, plan for roughly 07h 26m 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 43m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Village in Illinois
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Round Lake Beach and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Round Lake Beach and Decatur.
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1
Start on the route
43 m · 13 sec
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2
Turn right onto North Cedar Lake Road
1.4 mi · 3 min · North Cedar Lake Road
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3
Turn right onto Nippersink Avenue
696 ft · 19 sec · Nippersink Avenue
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4
Turn left onto South Cedar Lake Road
1.5 km · 2 min · South Cedar Lake Road
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5
Turn right onto West Belvidere Road
3.6 mi · 6 min · West Belvidere Road
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6
Turn left
720 ft · 17 sec
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7
Continue straight
575 ft · 7 sec
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8
Continue straight
1.7 mi · 2 min
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9
Continue straight
1.1 mi · 1 min
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10
Continue straight
14.3 mi · 21 min
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11
Take the ramp right toward IL 53 South
1668 ft · 41 sec
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12
Merge slight left
4.4 mi · 6 min
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13
Keep slight left to continue on I 290 East: Chicago, Biesterfield Road
7 mi · 9 min
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14
Keep slight left to continue on I 355 South Tollway: Joliet
20.1 mi · 25 min
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15
Take the exit slight right toward I 55 South: Joliet Road, Saint Louis
1453 ft · 36 sec
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16
Keep slight left to continue on Joliet Road South
1965 ft · 48 sec
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17
Keep slight left to continue on I 55 South: Saint Louis
706 ft · 17 sec
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18
Merge slight left onto Adlai Stevenson Expressway
111.5 mi · 2 hr 3 min · Adlai Stevenson Expressway
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19
Keep slight left to continue on I 74 East, US 51 South, US 55 Business North: Indianapolis, Decatur
2.1 mi · 2 min
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20
Take the exit slight right toward US 51 South, US 51 Business North: Decatur, Bloomington
1616 ft · 40 sec
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21
Continue on North 1450 East Road
14.7 mi · 18 min · North 1450 East Road
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22
Continue on North Walnut Street
23.2 mi · 30 min · North Walnut Street
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23
Turn straight
4.7 mi · 8 min
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24
Turn left onto East Wood Street
91 m · 8 sec · East Wood Street
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25
Arrive at your destination
0 m · 1 sec · East Wood Street
Car Route Details
A richer read on the saved driving route between Round Lake Beach 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
112 mi · 02h 03m
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.
Mostly Sunny leaving Round Lake Beach and Partly Sunny near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Round Lake Beach to Decatur?
The road trip is about 211.3 miles (340 km) and usually takes 03h 43m 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?
Dwight is a useful midpoint, sitting about 106.3 miles from Round Lake Beach and 105 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 180.6 miles (290.6 km), while the road route adds roughly 30.7 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 9:34 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $28.09 one way or $56.19 round trip. Estimated CO2 is about 66.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Round Lake Beach and Partly Sunny near Decatur.
Stop Ideas Near Dwight
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 Dwight.
Dwight station
Pontiac station
Kankakee
Gilman
Flight Path Map
This map shows the direct air route between Round Lake Beach and Decatur. Straight-line distance: 180.6 mi (290.65 km).
#1 Round Lake Beach
City in Illinois, United States of America
| Population | 26,919 |
| Coordinates | 42.3716900, -88.0900800 |
| Altitude | 233 |
| 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: 340 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 02m |
| 40 mph (64.37 km/h) | 05h 16m |
| 50 mph (80.47 km/h) | 04h 13m |
| 60 mph (96.56 km/h) | 03h 31m |
| 70 mph (112.65 km/h) | 03h 01m |
| 80 mph (129 km/h) | 02h 38m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $28.09 | $56.19 |
| Mid-grade | $4.25 | $31.68 | $63.37 |
| Premium | $4.65 | $34.67 | $69.34 |
| Diesel | $5.30 | $39.51 | $79.03 |
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 · May 31, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.