How far is Miles City, MT from Roundup, MT?
The driving distance from Miles City, MT to Roundup, MT is about 146.8 miles (236.2 km), with a travel time of about 03h 17m by car.
- The straight-line flight distance is about 128.7 miles (207.1 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, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Miles City and Roundup.
Turn-by-Turn Driving Directions
Step-by-step road directions between Miles City and Roundup.
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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
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5
Merge slight left
41.6 mi · 40 min
-
6
Take the exit slight right
1586 ft · 40 sec
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7
Turn right
101.3 mi · 2 hr 31 min
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8
Turn left onto Main Street
1310 ft · 22 sec · Main Street
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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 Miles City and Roundup.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Longest stretch
Turn right
101 mi · 02h 31m
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.
Mostly Sunny leaving Miles City and Mostly Sunny near Roundup.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Miles City to Roundup?
The road trip is about 146.8 miles (236.2 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?
Hysham is a useful midpoint, sitting about 73.2 miles from Miles City and 73.6 miles from Roundup.
How much longer is the road route than the straight-line distance?
The direct path is about 128.7 miles (207.1 km), while the road route adds roughly 18.1 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 $20.17 one way or $40.33 round trip. Estimated CO2 is about 46 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Miles City and Mostly Sunny near Roundup.
Stop Ideas Near Hysham
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 Hysham.
Miles City, MT
Billings, MT
Flight Path Map
This map shows the direct air route between Miles City and Roundup. Straight-line distance: 128.67 mi (207.07 km).
#1 Miles City
City in Custer County, Montana
| Population | 8,264 |
| Coordinates | 46.4083400, -105.8405600 |
| Altitude | 722 |
| Country | United States |
#2 Roundup
City in Musselshell County, Montana, United States
| Population | 1,864 |
| Coordinates | 46.4452400, -108.5418000 |
| Altitude | 980 |
| Country | United States |
End: Roundup (-108.5418, 46.44524)
Estimated Travel Time
Distance: 236 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 53m |
| 40 mph (64.37 km/h) | 03h 40m |
| 50 mph (80.47 km/h) | 02h 56m |
| 60 mph (96.56 km/h) | 02h 26m |
| 70 mph (112.65 km/h) | 02h 05m |
| 80 mph (129 km/h) | 01h 49m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $20.17 | $40.33 |
| Mid-grade | $4.23 | $21.92 | $43.83 |
| Premium | $4.55 | $23.56 | $47.13 |
| Diesel | $5.41 | $28.03 | $56.07 |
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 · May 02, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.