How far is City of Janesville, WI from Spencer, WI?
The driving distance from City of Janesville, WI to Spencer, WI is about 186.6 miles (300.3 km), with a travel time of about 03h 37m by car.
- The straight-line flight distance is about 156.8 miles (252.4 km).
- For a round trip, plan for roughly 07h 14m 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 37m.
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.
Town in Marquette County, Wisconsin
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny
Partly Sunny then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between City of Janesville and Spencer.
Turn-by-Turn Driving Directions
Step-by-step road directions between City of Janesville and Spencer.
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1
Start on East Court Street
45 m · 6 sec · East Court Street
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2
Turn right onto Harrison Street
156 m · 27 sec · Harrison Street
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3
Turn left onto East Milwaukee Street
841 ft · 21 sec · East Milwaukee Street
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4
Turn sharp right onto Milton Avenue
3.1 mi · 7 min · Milton Avenue
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5
Take the exit slight left
1.3 km · 2 min
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6
Merge slight left
61.3 mi · 1 hr 6 min
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7
Keep slight right to continue on WI 78 South, I 39 North: Merrimac, Portage, Wausau
1128 ft · 15 sec
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8
Continue on I 39 North: Portage, Wausau
80.2 mi · 1 hr 26 min
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9
Take the exit slight right toward US 10 West: Marshfield
27.8 mi · 33 min · US Highway 10
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10
Take the exit slight right toward WI 13, CTH A: Marshfield
1342 ft · 37 sec
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11
Keep slight right
12.5 mi · 22 min
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12
Turn left onto East Clark Street
93 m · 10 sec · East Clark Street
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13
Turn right onto North Wisconsin Street
92 m · 15 sec · North Wisconsin Street
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14
Turn right onto East Main Street
88 m · 15 sec · East Main Street
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15
Turn right onto North Pacific Street
66 m · 7 sec · North Pacific Street
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16
Arrive at your destination
0 m · 1 sec · North Pacific Street
Car Route Details
A richer read on the saved driving route between City of Janesville and Spencer.
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 North
Continue on I 39 North: Portage, Wausau
80.2 mi · 01h 26m
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.
Partly Sunny leaving City of Janesville and Partly Sunny then Chance Showers And Thunderstorms near Spencer.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from City of Janesville to Spencer?
The road trip is about 186.6 miles (300.3 km) and usually takes 03h 37m 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?
Westfield is a useful midpoint, sitting about 93.3 miles from City of Janesville and 93.3 miles from Spencer.
How much longer is the road route than the straight-line distance?
The direct path is about 156.8 miles (252.4 km), while the road route adds roughly 29.8 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 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 9:46 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $24.85 one way or $49.70 round trip. Estimated CO2 is about 58.6 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around City of Janesville and Partly Sunny then Chance Showers And Thunderstorms near Spencer.
Stop Ideas Near Westfield
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 Westfield.
Westfield, WI
Wisconsin Dells
Portage
Waupaca, Wisconsin
Flight Path Map
This map shows the direct air route between City of Janesville and Spencer. Straight-line distance: 156.84 mi (252.41 km).
#1 City of Janesville
The most populous city in Rock County, Wisconsin.
| Population | 64,128 |
| Coordinates | 42.6857000, -89.0138500 |
| Altitude | 261 |
| Country | United States |
#2 Spencer
Village in Marathon County, Wisconsin
| Population | 1,675 |
| Coordinates | 44.7577400, -90.2968000 |
| Altitude | 399 |
| Country | United States |
End: Spencer (-90.2968, 44.75774)
Estimated Travel Time
Distance: 300 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 13m |
| 40 mph (64.37 km/h) | 04h 39m |
| 50 mph (80.47 km/h) | 03h 43m |
| 60 mph (96.56 km/h) | 03h 06m |
| 70 mph (112.65 km/h) | 02h 39m |
| 80 mph (129 km/h) | 02h 19m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $24.85 | $49.70 |
| Mid-grade | $4.25 | $28.03 | $56.05 |
| Premium | $4.65 | $30.67 | $61.34 |
| Diesel | $5.30 | $34.95 | $69.91 |
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 Wisconsin · 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.