How far is Miles City, MT from Boulder, MT?
The driving distance from Miles City, MT to Boulder, MT is about 370.6 miles (596.4 km), with a travel time of about 06h 40m by car.
- The straight-line flight distance is about 299.8 miles (482.5 km).
- For a round trip, plan for roughly 13h 21m 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 06h 40m.
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.
Town in Stillwater County, Montana, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Miles City and Boulder.
Turn-by-Turn Driving Directions
Step-by-step road directions between Miles City and Boulder.
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1
Start on Main Street
1.1 mi · 2 min · Main Street
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2
Continue straight
1.9 mi · 3 min
-
3
Take the ramp straight
20 m · 2 sec
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4
Keep slight right
1487 ft · 36 sec
-
5
Merge slight left
135.4 mi · 2 hr 19 min
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6
Merge slight left
2.8 mi · 3 min
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7
Continue straight
112.8 mi · 1 hr 52 min
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8
Continue straight
7 mi · 7 min
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9
Continue straight
76.3 mi · 1 hr 16 min
-
10
Take the exit slight right toward MT 359: Cardwell, Boulder
1328 ft · 33 sec
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11
Turn right
1.2 mi · 2 min
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12
Turn right
31.5 mi · 55 min
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13
Turn left onto West Centennial Avenue
125 m · 18 sec · West Centennial Avenue
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14
Arrive at your destination
0 m · 1 sec · West Centennial Avenue
Car Route Details
A richer read on the saved driving route between Miles City and Boulder.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Main Street
Merge slight left
135 mi · 02h 19m
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.
Sunny leaving Miles City and Sunny near Boulder.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Miles City to Boulder?
The road trip is about 370.6 miles (596.4 km) and usually takes 06h 40m 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?
Columbus is a useful midpoint, sitting about 184.9 miles from Miles City and 185.7 miles from Boulder.
How much longer is the road route than the straight-line distance?
The direct path is about 299.8 miles (482.5 km), while the road route adds roughly 70.8 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 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 $50.92 one way or $101.84 round trip. Estimated CO2 is about 116.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Miles City and Sunny near Boulder.
Stop Ideas Near Columbus
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 Columbus.
Billings, MT
Livingston, MT
Flight Path Map
This map shows the direct air route between Miles City and Boulder. Straight-line distance: 299.82 mi (482.52 km).
#1 Miles City
City in Custer County, Montana
| Population | 8,264 |
| Coordinates | 46.4083400, -105.8405600 |
| Altitude | 722 |
| Country | United States |
#2 Boulder
Town in Montana
| Population | 1,291 |
| Coordinates | 46.2365900, -112.1208300 |
| Altitude | 1496 |
| Country | United States |
End: Boulder (-112.12083, 46.23659)
Estimated Travel Time
Distance: 596 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 12h 20m |
| 40 mph (64.37 km/h) | 09h 15m |
| 50 mph (80.47 km/h) | 07h 24m |
| 60 mph (96.56 km/h) | 06h 10m |
| 70 mph (112.65 km/h) | 05h 17m |
| 80 mph (129 km/h) | 04h 37m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $50.92 | $101.84 |
| Mid-grade | $4.23 | $55.34 | $110.68 |
| Premium | $4.55 | $59.50 | $119.00 |
| Diesel | $5.41 | $70.79 | $141.58 |
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 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.