How far is Sidney, MT from Dillon, MT?
The driving distance from Sidney, MT to Dillon, MT is about 526.4 miles (847.1 km), with a travel time of about 09h 19m by car.
- The straight-line flight distance is about 438.8 miles (706.1 km).
- For a round trip, plan for roughly 18h 38m 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 09h 19m.
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.
Human settlement in Yellowstone County, Montana, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Cloudy then Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Sidney and Dillon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Sidney and Dillon.
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1
Start on North Central Avenue
2.5 mi · 3 min · North Central Avenue
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2
Enter the roundabout and take exit 2 toward the route
41 m · 2 sec
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3
Exit the roundabout
48.9 mi · 56 min
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4
Take the exit right
1385 ft · 34 sec
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5
Merge slight left
212.8 mi · 3 hr 31 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
83.5 mi · 1 hr 23 min
-
10
Take the exit slight right toward MT 55: Whitehall
1408 ft · 42 sec
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11
Turn left onto Whitetail Road
69 m · 4 sec · Whitetail Road
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12
Continue on North Whitehall Street
2991 ft · 53 sec · North Whitehall Street
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13
At the end of the road, turn right onto West Legion Avenue
2124 ft · 40 sec · West Legion Avenue
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14
Turn left onto State Highway 55
9.6 mi · 14 min · State Highway 55
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15
Turn straight onto State Highway 55
1620 ft · 27 sec · State Highway 55
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16
Continue on Montana Highway 55
2.1 mi · 3 min · Montana Highway 55
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17
Continue on Montana Highway 41
14.4 mi · 21 min · Montana Highway 41
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18
Turn right onto West 4th Avenue
27.2 mi · 40 min · West 4th Avenue
-
19
Continue on Montana Street
1.2 km · 1 min · Montana Street
-
20
Turn left onto East Helena Street
108 m · 15 sec · East Helena Street
-
21
Turn right onto North Idaho Street
982 ft · 43 sec · North Idaho Street
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22
Arrive at your destination
0 m · 1 sec · South Idaho Street
Car Route Details
A richer read on the saved driving route between Sidney and Dillon.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
North Central Avenue
Merge slight left
213 mi · 03h 31m
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.
Mostly Clear leaving Sidney and Mostly Cloudy then Chance Rain Showers near Dillon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Sidney to Dillon?
The road trip is about 526.4 miles (847.1 km) and usually takes 09h 19m 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?
Lockwood is a useful midpoint, sitting about 262.7 miles from Sidney and 263.6 miles from Dillon.
How much longer is the road route than the straight-line distance?
The direct path is about 438.8 miles (706.1 km), while the road route adds roughly 87.6 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 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 $72.29 one way or $144.59 round trip. Estimated CO2 is about 165 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Clear around Sidney and Mostly Cloudy then Chance Rain Showers near Dillon.
Stop Ideas Near Lockwood
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 Lockwood.
Billings, MT
Flight Path Map
This map shows the direct air route between Sidney and Dillon. Straight-line distance: 438.73 mi (706.07 km).
#1 Sidney
City in Montana, United States
| Population | 6,297 |
| Coordinates | 47.7166800, -104.1563300 |
| Altitude | 594 |
| 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: 847 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 17h 32m |
| 40 mph (64.37 km/h) | 13h 09m |
| 50 mph (80.47 km/h) | 10h 31m |
| 60 mph (96.56 km/h) | 08h 46m |
| 70 mph (112.65 km/h) | 07h 31m |
| 80 mph (129 km/h) | 06h 33m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $72.29 | $144.59 |
| Mid-grade | $4.23 | $78.57 | $157.14 |
| Premium | $4.55 | $84.47 | $168.95 |
| Diesel | $5.41 | $100.50 | $201.00 |
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 16, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.