How far is Boulder, MT from Miles City, MT?
The driving distance from Boulder, MT to Miles City, MT is about 370.4 miles (596.1 km), with a travel time of about 05h 49m by car.
- The straight-line flight distance is about 299.8 miles (482.5 km).
- For a round trip, plan for roughly 11h 38m 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 05h 49m.
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 Stillwater County, Montana, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Rain Showers
Driving Route Map
The map below follows the saved road route between Boulder and Miles City.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boulder and Miles City.
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1
Start on West Centennial Avenue
112 m · 18 sec · West Centennial Avenue
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2
Turn right onto South Main Street
800 ft · 16 sec · South Main Street
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3
Continue on State Highway 69
31.4 mi · 55 min · State Highway 69
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4
At the end of the road, turn left
1.3 mi · 2 min
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5
Take the ramp left
1885 ft · 46 sec
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6
Merge slight left
199.2 mi · 3 hr 19 min
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7
Keep slight left to continue on I 94 East: Bismark
134.7 mi · 2 hr 20 min
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8
Take the exit slight right toward I 94 Business: Miles City, Jordan
3.6 mi · 6 min
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9
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Boulder and Miles City.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
State Highway 69
Merge slight left
199 mi · 03h 19m
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.
Light Snow leaving Boulder and Rain Showers near Miles City.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boulder to Miles City?
The road trip is about 370.4 miles (596.1 km) and usually takes 05h 49m 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?
Columbus is a useful midpoint, sitting about 185 miles from Boulder and 185.4 miles from Miles City.
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 70.6 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 5:22 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $50.88 one way or $101.76 round trip. Estimated CO2 is about 116.2 kg one way.
What should you check before leaving?
Before you leave, expect Light Snow around Boulder and Rain Showers near Miles City.
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 Boulder and Miles City. Straight-line distance: 299.82 mi (482.52 km).
#1 Boulder
Town in Montana
| Population | 1,291 |
| Coordinates | 46.2365900, -112.1208300 |
| Altitude | 1496 |
| Country | United States |
#2 Miles City
City in Custer County, Montana
| Population | 8,264 |
| Coordinates | 46.4083400, -105.8405600 |
| Altitude | 722 |
| Country | United States |
End: Main Street (-105.84056, 46.408351)
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 | $50.88 | $101.76 |
| Mid-grade | $4.23 | $55.30 | $110.60 |
| Premium | $4.55 | $59.46 | $118.91 |
| Diesel | $5.41 | $70.73 | $141.47 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.