How far is Plentywood, MT from Helena, MT?
The driving distance from Plentywood, MT to Helena, MT is about 499.6 miles (804.1 km), with a travel time of about 08h 18m by car.
- The straight-line flight distance is about 378.7 miles (609.5 km).
- For a round trip, plan for roughly 16h 37m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 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 08h 18m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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.
Census designated place
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny
Chance Light Rain then Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Plentywood and Helena.
Turn-by-Turn Driving Directions
Step-by-step road directions between Plentywood and Helena.
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1
Start on South Washington Street
64 m · 14 sec · South Washington Street
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2
Turn right onto West 1st Avenue
1.3 km · 56 sec · West 1st Avenue
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3
Continue on Theodore Roosevelt Expressway
46.1 mi · 52 min · Theodore Roosevelt Expressway
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4
Continue on 1st Avenue East
727 ft · 11 sec · 1st Avenue East
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5
Turn right onto 6th Street East
31.5 mi · 36 min · 6th Street East
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6
Enter the roundabout and take exit 2 toward the route
39 m · 2 sec
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7
Exit the roundabout
2836 ft · 36 sec
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8
Enter the roundabout and take exit 2 toward the route
38 m · 2 sec
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9
Exit the roundabout
232.3 mi · 4 hr 25 min
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10
Turn left
107.3 mi · 1 hr 58 min
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11
Continue on 15th Street Northeast
91 m · 6 sec · 15th Street Northeast
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12
Turn right onto Old Havre Highway
1.4 km · 1 min · Old Havre Highway
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13
Turn right onto Smelter Avenue Northeast
2860 ft · 43 sec · Smelter Avenue Northeast
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14
Turn straight onto 3rd Street Northwest
1.4 mi · 2 min · 3rd Street Northwest
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15
Turn right onto Central Avenue West
1.3 mi · 2 min · Central Avenue West
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16
Turn sharp left
1425 ft · 35 sec
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17
Merge slight left onto First Special Service Force Memorial Highway
86.3 mi · 1 hr 23 min · First Special Service Force Memorial Highway
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18
Take the exit slight right toward I 15 Business
1393 ft · 35 sec
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19
At the end of the road, turn right onto Cedar Street
2855 ft · 1 min · Cedar Street
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20
Continue on North Last Chance Gulch Street
1.2 mi · 3 min · North Last Chance Gulch Street
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21
Turn slight left onto Cruse Avenue
31 m · 4 sec · Cruse Avenue
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22
Arrive at your destination
0 m · 1 sec · Cruse Avenue
Car Route Details
A richer read on the saved driving route between Plentywood and Helena.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
6th Street East
Exit the roundabout
232 mi · 04h 25m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Partly Sunny leaving Plentywood and Chance Light Rain then Showers And Thunderstorms near Helena.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Plentywood to Helena?
The road trip is about 499.6 miles (804.1 km) and usually takes 08h 18m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Fort Belknap Agency is a useful midpoint, sitting about 255.3 miles from Plentywood and 244.4 miles from Helena.
How much longer is the road route than the straight-line distance?
The direct path is about 378.7 miles (609.5 km), while the road route adds roughly 120.9 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 7:30 AM MDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $68.63 one way or $137.27 round trip. Estimated CO2 is about 156.7 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Plentywood and Chance Light Rain then Showers And Thunderstorms near Helena.
Stop Ideas Near Fort Belknap Agency
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 Fort Belknap Agency.
Malta
Havre station
Flight Path Map
This map shows the direct air route between Plentywood and Helena. Straight-line distance: 378.71 mi (609.47 km).
#1 Plentywood
City in Sheridan County, Montana, United States
| Population | 1,712 |
| Coordinates | 48.7747500, -104.5624600 |
| Altitude | 624 |
| Country | United States |
#2 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 |
End: Cruse Avenue (-112.036062, 46.592722)
Estimated Travel Time
Distance: 804 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 16h 38m |
| 40 mph (64.37 km/h) | 12h 29m |
| 50 mph (80.47 km/h) | 09h 59m |
| 60 mph (96.56 km/h) | 08h 19m |
| 70 mph (112.65 km/h) | 07h 08m |
| 80 mph (129 km/h) | 06h 14m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $68.63 | $137.27 |
| Mid-grade | $4.23 | $74.59 | $149.19 |
| Premium | $4.55 | $80.20 | $160.40 |
| Diesel | $5.41 | $95.41 | $190.83 |
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 · Apr 22, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.