How far is Big Flats, WI from West Allis, WI?
The driving distance from Big Flats, WI to West Allis, WI is about 156.4 miles (251.7 km), with a travel time of about 02h 26m by car.
- The straight-line flight distance is about 117.7 miles (189.4 km).
- For a round trip, plan for roughly 04h 52m 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 26m.
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.
Village in Dane County, Wisconsin
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Cloudy then Slight Chance Showers And Thunderstorms
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between Big Flats and West Allis.
Turn-by-Turn Driving Directions
Step-by-step road directions between Big Flats and West Allis.
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1
Start on the route
6 m · 6 sec
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2
Turn left onto State Highway 13
6.1 mi · 8 min · State Highway 13
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3
Turn left onto State Highway 21
14.6 mi · 20 min · State Highway 21
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4
Take the exit right toward Portage
1657 ft · 41 sec
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5
Merge slight left
38.6 mi · 41 min
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6
Keep slight right
29.6 mi · 32 min
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7
Keep slight left to continue on I 94: Milwaukee
65.1 mi · 1 hr 11 min
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8
Take the exit slight right toward WI 181: 84th Street
1.5 km · 2 min
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9
Keep slight right to continue on WI 181 South: 84th Street South, Milwaukee Mile Speedway, Pettit National Ice Center
59 m · 5 sec
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10
Turn right onto South 84th Street
1.1 km · 2 min · South 84th Street
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11
Turn left onto West Greenfield Avenue
2754 ft · 2 min · West Greenfield Avenue
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12
Arrive at your destination
0 m · 1 sec · West Greenfield Avenue
Car Route Details
A richer read on the saved driving route between Big Flats and West Allis.
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 94
Keep slight left to continue on I 94: Milwaukee
65.1 mi · 01h 11m
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 Cloudy then Slight Chance Showers And Thunderstorms leaving Big Flats and Chance Showers And Thunderstorms then Showers And Thunderstorms Likely near West Allis.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Big Flats to West Allis?
The road trip is about 156.4 miles (251.7 km) and usually takes 02h 26m 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?
De Forest is a useful midpoint, sitting about 78.1 miles from Big Flats and 78.3 miles from West Allis.
How much longer is the road route than the straight-line distance?
The direct path is about 117.7 miles (189.4 km), while the road route adds roughly 38.7 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 1:38 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $20.82 one way or $41.63 round trip. Estimated CO2 is about 49.1 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Cloudy then Slight Chance Showers And Thunderstorms around Big Flats and Chance Showers And Thunderstorms then Showers And Thunderstorms Likely near West Allis.
Stop Ideas Near De Forest
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 De Forest.
Madison, Wisconsin
Madison (South), Wisconsin
Columbus
Portage
Flight Path Map
This map shows the direct air route between Big Flats and West Allis. Straight-line distance: 117.71 mi (189.43 km).
#1 Big Flats
Civil town in Adams County, Wisconsin
| Population | 1,013 |
| Coordinates | 44.1119100, -89.8079000 |
| Altitude | 305 |
| Country | United States |
#2 West Allis
The most populous city in Milwaukee County, Wisconsin.
| Population | 59,748 |
| Coordinates | 43.0166800, -88.0070300 |
| Altitude | 222 |
| Country | United States |
End: West Greenfield Avenue (-88.007075, 43.01665)
Estimated Travel Time
Distance: 252 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 12m |
| 40 mph (64.37 km/h) | 03h 54m |
| 50 mph (80.47 km/h) | 03h 07m |
| 60 mph (96.56 km/h) | 02h 36m |
| 70 mph (112.65 km/h) | 02h 14m |
| 80 mph (129 km/h) | 01h 57m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $20.82 | $41.63 |
| Mid-grade | $4.25 | $23.48 | $46.95 |
| Premium | $4.65 | $25.69 | $51.38 |
| Diesel | $5.30 | $29.28 | $58.56 |
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 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.