How far is Decatur, IL from Quincy, IL?
The driving distance from Decatur, IL to Quincy, IL is about 150.1 miles (241.6 km), with a travel time of about 02h 53m by car.
- The straight-line flight distance is about 130.3 miles (209.7 km).
- For a round trip, plan for roughly 05h 47m 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 53m.
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 Illinois, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Showers And Thunderstorms then Mostly Sunny
Driving Route Map
The map below follows the saved road route between Decatur and Quincy.
Turn-by-Turn Driving Directions
Step-by-step road directions between Decatur and Quincy.
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1
Start on East Wood Street
155 m · 23 sec · East Wood Street
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2
Turn left onto South Franklin Street
1982 ft · 49 sec · South Franklin Street
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3
Turn left onto West Eldorado Street
35.8 mi · 41 min · West Eldorado Street
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4
Take the exit slight right toward I 55 South, I 72 West: Saint Louis, Jacksonville
5.3 mi · 7 min
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5
Keep slight right to continue on I 72 West, US 36 West: Jacksonville
92.9 mi · 1 hr 40 min
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6
Keep slight left to continue on I 172 North: Quincy
1.3 km · 51 sec
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7
Continue on Chicago-Kansas City Expressway
2.2 mi · 2 min · Chicago-Kansas City Expressway
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8
Take the exit slight right toward IL 57: Marblehead, Quincy
2698 ft · 1 min
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9
Turn left
11.8 mi · 21 min
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10
Turn left
2248 ft · 43 sec
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11
Turn right
22 m · 2 sec
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12
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Decatur and Quincy.
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 West
Keep slight right to continue on I 72 West, US 36 West: Jacksonville
92.9 mi · 01h 40m
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.
Slight Chance Showers And Thunderstorms then Mostly Sunny leaving Decatur and Sunny near Quincy.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Decatur to Quincy?
The road trip is about 150.1 miles (241.6 km) and usually takes 02h 53m 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?
South Jacksonville is a useful midpoint, sitting about 74.9 miles from Decatur and 75.2 miles from Quincy.
How much longer is the road route than the straight-line distance?
The direct path is about 130.3 miles (209.7 km), while the road route adds roughly 19.8 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 12:42 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $19.99 one way or $39.97 round trip. Estimated CO2 is about 47.1 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Showers And Thunderstorms then Mostly Sunny around Decatur and Sunny near Quincy.
Stop Ideas Near South Jacksonville
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 South Jacksonville.
Springfield station
Carlinville
Lincoln
Alton
Flight Path Map
This map shows the direct air route between Decatur and Quincy. Straight-line distance: 130.32 mi (209.73 km).
#1 Decatur
The most populous city in Macon County, Illinois.
| Population | 70,007 |
| Coordinates | 39.8403100, -88.9548000 |
| Altitude | 205 |
| Country | United States |
#2 Quincy
County seat of Adams County, Illinois, United States
| Population | 39,589 |
| Coordinates | 39.9356000, -91.4098700 |
| Altitude | 173 |
| Country | United States |
End: Quincy (-91.40987, 39.9356)
Estimated Travel Time
Distance: 242 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 00m |
| 40 mph (64.37 km/h) | 03h 45m |
| 50 mph (80.47 km/h) | 03h 00m |
| 60 mph (96.56 km/h) | 02h 30m |
| 70 mph (112.65 km/h) | 02h 08m |
| 80 mph (129 km/h) | 01h 52m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $19.99 | $39.97 |
| Mid-grade | $4.25 | $22.54 | $45.08 |
| Premium | $4.65 | $24.67 | $49.33 |
| Diesel | $5.30 | $28.11 | $56.22 |
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.