How far is Flagg, IL from Decatur, IL?
The driving distance from Flagg, IL to Decatur, IL is about 155 miles (249.5 km), with a travel time of about 02h 36m by car.
- The straight-line flight distance is about 142.4 miles (229.1 km).
- For a round trip, plan for roughly 05h 12m 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 36m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
City in Woodford County, Illinois, United States
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 Flagg and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Flagg and Decatur.
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1
Start on East Titus Road
19 m · 5 sec · East Titus Road
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2
Turn right onto South Grange Road
1.1 mi · 4 min · South Grange Road
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3
Turn right onto Lincoln Avenue
4 mi · 7 min · Lincoln Avenue
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4
Turn left onto 8th Street
122 m · 11 sec · 8th Street
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5
Turn right onto 4th Avenue
81 m · 5 sec · 4th Avenue
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6
Turn right
1.7 mi · 3 min
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7
Turn left
2198 ft · 54 sec
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8
Merge slight left onto Ronald Reagan Memorial Tollway
1.6 mi · 2 min · Ronald Reagan Memorial Tollway
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9
Take the exit slight right toward I 39 South, US 51 South: Bloomington, Normal
1.1 km · 1 min
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10
Merge slight left
96.4 mi · 1 hr 43 min
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11
Keep slight right to continue on I 55 South, US 51 South: Peoria, Champaign, Saint Louis, Decatur
7.6 mi · 8 min
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12
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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13
Take the exit slight right toward US 51 South, US 51 Business North: Decatur, Bloomington
1616 ft · 40 sec
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14
Continue on North 1450 East Road
14.7 mi · 18 min · North 1450 East Road
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15
Continue on North Walnut Street
23.2 mi · 30 min · North Walnut Street
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16
Turn straight
4.7 mi · 8 min
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17
Turn left onto East Wood Street
91 m · 8 sec · East Wood Street
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18
Arrive at your destination
0 m · 1 sec · East Wood Street
Car Route Details
A richer read on the saved driving route between Flagg 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.
I 39 South
Merge slight left
96.4 mi · 01h 43m
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 Flagg and Sunny near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Flagg to Decatur?
The road trip is about 155 miles (249.5 km) and usually takes 02h 36m 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?
Minonk is a useful midpoint, sitting about 79.3 miles from Flagg and 75.7 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 142.4 miles (229.1 km), while the road route adds roughly 12.6 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 1:18 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $20.63 one way or $41.25 round trip. Estimated CO2 is about 48.6 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Flagg and Sunny near Decatur.
Stop Ideas Near Minonk
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 Minonk.
Pontiac station
Uptown Station
Dwight station
Peoria, Illinois
Flight Path Map
This map shows the direct air route between Flagg and Decatur. Straight-line distance: 142.36 mi (229.1 km).
#1 Flagg
City in Illinois, United States of America
| Population | 12,745 |
| Coordinates | 41.8958600, -89.1409300 |
| Altitude | 238 |
| 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: 249 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 09m |
| 40 mph (64.37 km/h) | 03h 52m |
| 50 mph (80.47 km/h) | 03h 06m |
| 60 mph (96.56 km/h) | 02h 35m |
| 70 mph (112.65 km/h) | 02h 12m |
| 80 mph (129 km/h) | 01h 56m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $20.63 | $41.25 |
| Mid-grade | $4.25 | $23.26 | $46.53 |
| Premium | $4.65 | $25.46 | $50.91 |
| Diesel | $5.30 | $29.01 | $58.03 |
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 · 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.