How far is Helena, MT from Sun Prairie, MT?
The driving distance from Helena, MT to Sun Prairie, MT is about 97.1 miles (156.3 km), with a travel time of about 01h 42m by car.
- The straight-line flight distance is about 70.3 miles (113.1 km).
- For a round trip, plan for roughly 03h 25m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MDT.
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 42m.
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.
Town in Cascade County, Montana, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Helena and Sun Prairie.
Turn-by-Turn Driving Directions
Step-by-step road directions between Helena and Sun Prairie.
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1
Start on Cruse Avenue
31 m · 6 sec · Cruse Avenue
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2
Turn slight right onto North Last Chance Gulch Street
1.1 mi · 3 min · North Last Chance Gulch Street
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3
Keep slight right to continue on North Last Chance Gulch Street
677 ft · 18 sec · North Last Chance Gulch Street
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4
Continue on Cedar Street
1.2 km · 2 min · Cedar Street
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5
Take the ramp slight right toward I 15 North: Great Falls
1119 ft · 27 sec
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6
Merge slight left onto First Special Service Force Memorial Highway
92.6 mi · 1 hr 30 min · First Special Service Force Memorial Highway
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7
Take the exit slight right
877 ft · 28 sec
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8
Turn left onto North Manchester Road
1144 ft · 27 sec · North Manchester Road
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9
At the end of the road, turn right onto Vaughn South Frontage Road
2437 ft · 55 sec · Vaughn South Frontage Road
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10
Turn left onto South Manchester Road
2802 ft · 2 min · South Manchester Road
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11
Turn right onto Manchester Lane
1.5 km · 4 min · Manchester Lane
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12
Arrive at your destination
0 m · 1 sec · Manchester Lane
Car Route Details
A richer read on the saved driving route between Helena and Sun Prairie.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
First Special Service Force Memorial Highway
Merge slight left onto First Special Service Force Memorial Highway
92.6 mi · 01h 30m
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.
Sunny leaving Helena and Sunny near Sun Prairie.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Helena to Sun Prairie?
The road trip is about 97.1 miles (156.3 km) and usually takes 01h 42m 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?
Cascade is a useful midpoint, sitting about 48.5 miles from Helena and 48.7 miles from Sun Prairie.
How much longer is the road route than the straight-line distance?
The direct path is about 70.3 miles (113.1 km), while the road route adds roughly 26.8 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 MDT. If you want a more comfortable same-day return, try to leave by 3:04 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $15.41 one way or $30.83 round trip. Estimated CO2 is about 30.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Helena and Sunny near Sun Prairie.
Flight Path Map
This map shows the direct air route between Helena and Sun Prairie. Straight-line distance: 70.26 mi (113.08 km).
#1 Helena
State capital of Montana, United States and seat of Lewis and Clark County
| Population | 33,737 |
| Coordinates | 46.5927100, -112.0361100 |
| Altitude | 1237 |
| Country | United States |
#2 Sun Prairie
Situated in Cascade County at an elevation of 3,340 feet, this central Montana community lies northwest of Great Falls along the Sun River.
| Population | 0 |
| Coordinates | 47.5369000, -111.4813600 |
| Altitude | 1018 |
| Country | United States |
End: Sun Prairie (-111.48136, 47.5369)
Estimated Travel Time
Distance: 156 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 14m |
| 40 mph (64.37 km/h) | 02h 25m |
| 50 mph (80.47 km/h) | 01h 56m |
| 60 mph (96.56 km/h) | 01h 37m |
| 70 mph (112.65 km/h) | 01h 23m |
| 80 mph (129 km/h) | 01h 12m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.49 | $15.41 | $30.83 |
| Mid-grade | $4.83 | $16.55 | $33.10 |
| Premium | $5.19 | $17.81 | $35.62 |
| Diesel | $6.11 | $20.96 | $41.91 |
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 Montana · Oct 15, 2026