How far is Dillon, MT from Great Falls, MT?
The driving distance from Dillon, MT to Great Falls, MT is about 218 miles (350.9 km), with a travel time of about 03h 17m by car.
- The straight-line flight distance is about 170.2 miles (273.9 km).
- For a round trip, plan for roughly 06h 35m 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 03h 17m.
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.
Town in Montana
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Light Rain then Showers And Thunderstorms Likely
Partly Sunny then Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between Dillon and Great Falls.
Turn-by-Turn Driving Directions
Step-by-step road directions between Dillon and Great Falls.
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1
Start on South Idaho Street
107 m · 21 sec · South Idaho Street
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2
Turn left onto East Bannack Street
1489 ft · 41 sec · East Bannack Street
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3
Continue on Black Tail Boulevard
2999 ft · 1 min · Black Tail Boulevard
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4
Turn left
127 m · 7 sec
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5
Take the ramp straight
57 m · 5 sec
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6
Keep slight right
60.6 mi · 57 min
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7
Keep slight right
4.8 mi · 5 min
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8
Take the exit slight right toward I 15 North: Helena
148.8 mi · 2 hr 25 min
-
9
Take the exit slight right toward I 15 Business, US 89 South, MT 200 East
2016 ft · 49 sec
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10
Continue on Country Club Boulevard
1.4 mi · 2 min · Country Club Boulevard
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11
Continue on 10th Avenue South
1.1 km · 58 sec · 10th Avenue South
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12
Turn left onto 4th Street South
2216 ft · 2 min · 4th Street South
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13
Arrive at your destination
0 m · 1 sec · 4th Street South
Car Route Details
A richer read on the saved driving route between Dillon and Great Falls.
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 15 North
Take the exit slight right toward I 15 North: Helena
149 mi · 02h 25m
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.
Chance Light Rain then Showers And Thunderstorms Likely leaving Dillon and Partly Sunny then Showers And Thunderstorms Likely near Great Falls.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Dillon to Great Falls?
The road trip is about 218 miles (350.9 km) and usually takes 03h 17m 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?
Boulder is a useful midpoint, sitting about 108.9 miles from Dillon and 109.1 miles from Great Falls.
How much longer is the road route than the straight-line distance?
The direct path is about 170.2 miles (273.9 km), while the road route adds roughly 47.8 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 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 10:24 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $29.94 one way or $59.87 round trip. Estimated CO2 is about 68.3 kg one way.
What should you check before leaving?
Before you leave, expect Chance Light Rain then Showers And Thunderstorms Likely around Dillon and Partly Sunny then Showers And Thunderstorms Likely near Great Falls.
Stop Ideas Near Boulder
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 Boulder.
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Flight Path Map
This map shows the direct air route between Dillon and Great Falls. Straight-line distance: 170.18 mi (273.88 km).
#1 Dillon
City in Montana, United States
| Population | 4,333 |
| Coordinates | 45.2163100, -112.6375200 |
| Altitude | 1555 |
| Country | United States |
#2 Great Falls
Town in Cascade County, Montana, United States
| Population | 58,353 |
| Coordinates | 47.5002400, -111.3008100 |
| Altitude | 1015 |
| Country | United States |
End: 4th Street South (-111.300848, 47.50024)
Estimated Travel Time
Distance: 351 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 15m |
| 40 mph (64.37 km/h) | 05h 27m |
| 50 mph (80.47 km/h) | 04h 21m |
| 60 mph (96.56 km/h) | 03h 38m |
| 70 mph (112.65 km/h) | 03h 06m |
| 80 mph (129 km/h) | 02h 43m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $29.94 | $59.87 |
| Mid-grade | $4.23 | $32.54 | $65.07 |
| Premium | $4.55 | $34.98 | $69.96 |
| Diesel | $5.41 | $41.62 | $83.24 |
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.