How far is Helena, MT from Dillon, MT?
The driving distance from Helena, MT to Dillon, MT is about 130.8 miles (210.5 km), with a travel time of about 02h 13m by car.
- The straight-line flight distance is about 99.4 miles (160 km).
- For a round trip, plan for roughly 04h 26m 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 02h 13m.
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.
Consolidated city-county in Montana, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny
Mostly Cloudy
Driving Route Map
The map below follows the saved road route between Helena and Dillon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Helena and Dillon.
-
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
-
3
Turn straight onto Prospect Avenue
835 ft · 22 sec · Prospect Avenue
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4
Take the exit slight right toward I 15 South: Butte
1984 ft · 49 sec
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5
Merge slight left onto First Special Service Force Memorial Highway
69.6 mi · 1 hr 10 min · First Special Service Force Memorial Highway
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6
Keep slight right to continue on I 15 South: Dillon, Idaho Falls
57.5 mi · 54 min
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7
Take the exit slight right toward I 15 Business, MT 41: Dillon, Twin Bridges
1.3 km · 2 min
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8
Turn right onto Black Tail Boulevard
2970 ft · 1 min · Black Tail Boulevard
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9
Continue on West Bannack Street
1489 ft · 43 sec · West Bannack Street
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10
Turn right onto South Idaho Street
107 m · 15 sec · South Idaho Street
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11
Arrive at your destination
0 m · 1 sec · South Idaho Street
Car Route Details
A richer read on the saved driving route between Helena and Dillon.
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
69.6 mi · 01h 10m
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.
Partly Sunny leaving Helena and Mostly Cloudy near Dillon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Helena to Dillon?
The road trip is about 130.8 miles (210.5 km) and usually takes 02h 13m 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?
Butte is a useful midpoint, sitting about 65.4 miles from Helena and 65.4 miles from Dillon.
How much longer is the road route than the straight-line distance?
The direct path is about 99.4 miles (160 km), while the road route adds roughly 31.4 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 2:04 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $17.99 one way or $35.97 round trip. Estimated CO2 is about 41.1 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Helena and Mostly Cloudy near Dillon.
Flight Path Map
This map shows the direct air route between Helena and Dillon. Straight-line distance: 99.4 mi (159.97 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 Dillon
City in Montana, United States
| Population | 4,333 |
| Coordinates | 45.2163100, -112.6375200 |
| Altitude | 1555 |
| Country | United States |
End: Dillon (-112.63752, 45.21631)
Estimated Travel Time
Distance: 211 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 21m |
| 40 mph (64.37 km/h) | 03h 16m |
| 50 mph (80.47 km/h) | 02h 36m |
| 60 mph (96.56 km/h) | 02h 10m |
| 70 mph (112.65 km/h) | 01h 52m |
| 80 mph (129 km/h) | 01h 37m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $17.99 | $35.97 |
| Mid-grade | $4.23 | $19.55 | $39.09 |
| Premium | $4.55 | $21.02 | $42.03 |
| Diesel | $5.41 | $25.00 | $50.01 |
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 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.