How far is Markham, IL from Decatur, IL?
The driving distance from Markham, IL to Decatur, IL is about 85.9 miles (138.2 km), with a travel time of about 01h 22m by car.
- The straight-line flight distance is about 73.2 miles (117.8 km).
- For a round trip, plan for roughly 02h 45m 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 01h 22m.
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.
Township in Sangamon 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 Markham and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Markham and Decatur.
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1
Start on Markham Road
1.1 mi · 4 min · Markham Road
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2
Turn right onto US Highway 67
6.4 mi · 7 min · US Highway 67
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3
Take the exit slight right toward I 72 East: Quincy
1842 ft · 45 sec
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4
Merge slight left
41.9 mi · 45 min
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5
Take the exit slight right toward I 72 East, US 36 East: Decatur
30 mi · 33 min
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6
Take the exit slight right toward US 36 East, US 51 South: Decatur, Pana
1656 ft · 41 sec
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7
Keep slight left to continue on US 36 East: Decatur
5.5 mi · 8 min
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8
Turn right onto North Main Street
1985 ft · 49 sec · North Main Street
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9
Turn left onto East Wood Street
91 m · 8 sec · East Wood Street
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10
Arrive at your destination
0 m · 1 sec · East Wood Street
Car Route Details
A richer read on the saved driving route between Markham 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 72 East
Merge slight left
41.9 mi · 00h 45m
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 Markham and Sunny near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Markham to Decatur?
The road trip is about 85.9 miles (138.2 km) and usually takes 01h 22m 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?
Woodside is a useful midpoint, sitting about 42.9 miles from Markham and 43 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 73.2 miles (117.8 km), while the road route adds roughly 12.7 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 3:44 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.43 one way or $22.85 round trip. Estimated CO2 is about 26.9 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Markham and Sunny near Decatur.
Stop Ideas Near Woodside
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 Woodside.
Springfield station
Carlinville
Lincoln
Alton
Flight Path Map
This map shows the direct air route between Markham and Decatur. Straight-line distance: 73.19 mi (117.78 km).
#1 Markham
City in Morgan County, Illinois, United States
| Population | 12,165 |
| Coordinates | 39.7458800, -90.3279000 |
| Altitude | 181 |
| 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: 138 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 51m |
| 40 mph (64.37 km/h) | 02h 08m |
| 50 mph (80.47 km/h) | 01h 43m |
| 60 mph (96.56 km/h) | 01h 25m |
| 70 mph (112.65 km/h) | 01h 13m |
| 80 mph (129 km/h) | 01h 04m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $11.43 | $22.85 |
| Mid-grade | $4.25 | $12.89 | $25.77 |
| Premium | $4.65 | $14.10 | $28.20 |
| Diesel | $5.30 | $16.07 | $32.14 |
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.