How far is Helena, MT from Roundup, MT?
The driving distance from Helena, MT to Roundup, MT is about 203.1 miles (326.8 km), with a travel time of about 04h 21m by car.
- The straight-line flight distance is about 166.4 miles (267.8 km).
- For a round trip, plan for roughly 08h 43m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
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 04h 21m.
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.
City in Montana
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny then Slight Chance Light Rain
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Helena and Roundup.
Turn-by-Turn Driving Directions
Step-by-step road directions between Helena and Roundup.
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1
Start on Cruse Avenue
50 m · 8 sec · Cruse Avenue
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2
Turn left onto 11th Avenue
1.4 mi · 4 min · 11th Avenue
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3
Turn straight onto Prospect Avenue
1.3 mi · 2 min · Prospect Avenue
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4
Continue straight
3.6 mi · 5 min
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5
Continue straight
1678 ft · 26 sec
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6
Continue straight
27.3 mi · 31 min
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7
Turn left onto Broadway Street
42.1 mi · 47 min · Broadway Street
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8
Turn right onto West Main Street
58 mi · 1 hr 25 min · West Main Street
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9
Continue on 3rd Street Northeast
1.2 km · 1 min · 3rd Street Northeast
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10
Continue straight
66.5 mi · 1 hr 23 min
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11
At the end of the road, turn left
1.6 mi · 2 min
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12
Turn left onto Main Street
1245 ft · 21 sec · Main Street
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13
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Helena and Roundup.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
3rd Street Northeast
Continue straight
66.5 mi · 01h 23m
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 then Slight Chance Light Rain leaving Helena and Mostly Sunny near Roundup.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Helena to Roundup?
The road trip is about 203.1 miles (326.8 km) and usually takes 04h 21m 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?
White Sulphur Springs is a useful midpoint, sitting about 101.3 miles from Helena and 101.7 miles from Roundup.
How much longer is the road route than the straight-line distance?
The direct path is about 166.4 miles (267.8 km), while the road route adds roughly 36.7 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 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 8:16 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $27.87 one way or $55.75 round trip. Estimated CO2 is about 63.6 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny then Slight Chance Light Rain around Helena and Mostly Sunny near Roundup.
Stop Ideas Near White Sulphur Springs
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 White Sulphur Springs.
Bozeman, MT
Livingston, MT
Flight Path Map
This map shows the direct air route between Helena and Roundup. Straight-line distance: 166.43 mi (267.85 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 Roundup
City in Musselshell County, Montana, United States
| Population | 1,864 |
| Coordinates | 46.4452400, -108.5418000 |
| Altitude | 980 |
| Country | United States |
End: Roundup (-108.5418, 46.44524)
Estimated Travel Time
Distance: 327 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 45m |
| 40 mph (64.37 km/h) | 05h 04m |
| 50 mph (80.47 km/h) | 04h 03m |
| 60 mph (96.56 km/h) | 03h 23m |
| 70 mph (112.65 km/h) | 02h 54m |
| 80 mph (129 km/h) | 02h 31m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $27.87 | $55.75 |
| Mid-grade | $4.23 | $30.29 | $60.59 |
| Premium | $4.55 | $32.57 | $65.14 |
| Diesel | $5.41 | $38.75 | $77.50 |
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 · May 02, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.