How far is Dillon, MT from Sidney, MT?
The driving distance from Dillon, MT to Sidney, MT is about 526 miles (846.5 km), with a travel time of about 08h 04m by car.
- The straight-line flight distance is about 438.8 miles (706.1 km).
- For a round trip, plan for roughly 16h 08m 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 08h 04m.
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 Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Dillon and Sidney.
Turn-by-Turn Driving Directions
Step-by-step road directions between Dillon and Sidney.
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1
Start on South Idaho Street
982 ft · 43 sec · South Idaho Street
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2
Turn left onto East Helena Street
105 m · 16 sec · East Helena Street
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3
At the end of the road, turn right onto Montana Street
1.3 km · 1 min · Montana Street
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4
Continue straight
27.1 mi · 40 min
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5
At the end of the road, turn left onto Main Street
14.4 mi · 21 min · Main Street
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6
Turn straight onto Montana Highway 55
2.1 mi · 3 min · Montana Highway 55
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7
Continue on State Highway 55
1620 ft · 27 sec · State Highway 55
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8
Turn straight onto Mount Highway 55
9.6 mi · 14 min · Mount Highway 55
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9
Turn right onto West Legion Avenue
2124 ft · 41 sec · West Legion Avenue
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10
Turn left onto North Whitehall Street
2744 ft · 49 sec · North Whitehall Street
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11
Take the ramp right
1023 ft · 25 sec
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12
Merge slight left
206.6 mi · 3 hr 26 min
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13
Keep slight left to continue on I 94 East: Bismark
212.2 mi · 3 hr 33 min
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14
Take the exit slight right toward MT 16: Glendive, Sidney
1422 ft · 38 sec
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15
Turn left
49 mi · 56 min
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16
Enter the roundabout and take exit 2 toward South Central Avenue
40 m · 2 sec · South Central Avenue
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17
Exit the roundabout onto South Central Avenue
2.5 mi · 3 min · South Central Avenue
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18
Arrive at your destination
0 m · 1 sec · North Central Avenue
Car Route Details
A richer read on the saved driving route between Dillon and Sidney.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 94 East
Keep slight left to continue on I 94 East: Bismark
212 mi · 03h 33m
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 Sunny leaving Dillon and Partly Sunny near Sidney.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Dillon to Sidney?
The road trip is about 526 miles (846.5 km) and usually takes 08h 04m 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 Dillon and 263.3 miles from Sidney.
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 87.2 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 $72.25 one way or $144.51 round trip. Estimated CO2 is about 164.9 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Dillon and Partly Sunny near Sidney.
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 Dillon and Sidney. Straight-line distance: 438.73 mi (706.07 km).
#1 Dillon
City in Montana, United States
| Population | 4,333 |
| Coordinates | 45.2163100, -112.6375200 |
| Altitude | 1555 |
| Country | United States |
#2 Sidney
City in Montana, United States
| Population | 6,297 |
| Coordinates | 47.7166800, -104.1563300 |
| Altitude | 594 |
| Country | United States |
End: North Central Avenue (-104.156325, 47.716678)
Estimated Travel Time
Distance: 846 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 17h 31m |
| 40 mph (64.37 km/h) | 13h 08m |
| 50 mph (80.47 km/h) | 10h 31m |
| 60 mph (96.56 km/h) | 08h 45m |
| 70 mph (112.65 km/h) | 07h 30m |
| 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 | $72.25 | $144.51 |
| Mid-grade | $4.23 | $78.53 | $157.05 |
| Premium | $4.55 | $84.43 | $168.86 |
| Diesel | $5.41 | $100.45 | $200.89 |
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 · Jun 10, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.