How far is Monmouth, IL from Naperville, IL?
The driving distance from Monmouth, IL to Naperville, IL is about 185.7 miles (298.8 km), with a travel time of about 02h 48m by car.
- The straight-line flight distance is about 143 miles (230.2 km).
- For a round trip, plan for roughly 05h 37m 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 48m.
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 Livingston County, Illinois
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Showers And Thunderstorms then Mostly Cloudy
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Monmouth and Naperville.
Turn-by-Turn Driving Directions
Step-by-step road directions between Monmouth and Naperville.
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1
Start on South 1st Street
65 m · 15 sec · South 1st Street
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2
Turn left onto East Broadway
89 m · 8 sec · East Broadway
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3
Enter the roundabout and take exit 1 toward Public Square
5 m · 1 sec · North Main Street
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4
Exit the rotary onto North Main Street
1.4 km · 2 min · North Main Street
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5
Take the ramp slight right
84 m · 8 sec
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6
Merge slight left onto Chicago-Kansas City Expressway
18.9 mi · 22 min · Chicago-Kansas City Expressway
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7
Keep slight right to continue on Chicago-Kansas City Expressway
31.9 mi · 35 min · Chicago-Kansas City Expressway
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8
Keep slight left to continue on Chicago-Kansas City Expressway
6.3 mi · 7 min · Chicago-Kansas City Expressway
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9
Take the exit slight right toward I 88 East, IL 92 East: Sterling, Rock Falls
125 mi · 2 hr 16 min
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10
Take the exit slight right toward Winfield Road
2012 ft · 49 sec
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11
Turn right onto Winfield Road
936 ft · 26 sec · Winfield Road
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12
Turn left onto West Diehl Road
1.1 km · 1 min · West Diehl Road
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13
Turn right onto Mill Street
1.1 mi · 2 min · Mill Street
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14
Turn left onto West Ogden Avenue
1972 ft · 49 sec · West Ogden Avenue
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15
Turn left onto North Washington Street
15 m · 1 sec · North Washington Street
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16
Arrive at your destination
0 m · 1 sec · North Washington Street
Car Route Details
A richer read on the saved driving route between Monmouth and Naperville.
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 88 East
Take the exit slight right toward I 88 East, IL 92 East: Sterling, Rock Falls
125 mi · 02h 16m
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 Cloudy leaving Monmouth and Mostly Sunny near Naperville.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Monmouth to Naperville?
The road trip is about 185.7 miles (298.8 km) and usually takes 02h 48m 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?
Round Grove is a useful midpoint, sitting about 92.8 miles from Monmouth and 92.8 miles from Naperville.
How much longer is the road route than the straight-line distance?
The direct path is about 143 miles (230.2 km), while the road route adds roughly 42.7 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 12:52 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $24.70 one way or $49.40 round trip. Estimated CO2 is about 58.2 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Showers And Thunderstorms then Mostly Cloudy around Monmouth and Mostly Sunny near Naperville.
Stop Ideas Near Round Grove
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 Round Grove.
Princeton
Kewanee
Moline, Illinois
Rock Island, IL
Flight Path Map
This map shows the direct air route between Monmouth and Naperville. Straight-line distance: 143.05 mi (230.22 km).
#1 Monmouth
City in Warren County, Illinois, United States
| Population | 8,801 |
| Coordinates | 40.9114300, -90.6473600 |
| Altitude | 232 |
| Country | United States |
#2 Naperville
The second most populous city in Illinois.
| Population | 147,986 |
| Coordinates | 41.7858600, -88.1472900 |
| Altitude | 216 |
| Country | United States |
End: North Washington Street (-88.147302, 41.785837)
Estimated Travel Time
Distance: 299 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 11m |
| 40 mph (64.37 km/h) | 04h 38m |
| 50 mph (80.47 km/h) | 03h 42m |
| 60 mph (96.56 km/h) | 03h 05m |
| 70 mph (112.65 km/h) | 02h 39m |
| 80 mph (129 km/h) | 02h 18m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $24.70 | $49.40 |
| Mid-grade | $4.25 | $27.86 | $55.71 |
| Premium | $4.65 | $30.48 | $60.97 |
| Diesel | $5.30 | $34.74 | $69.48 |
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.