How far is Sidney, MT from Helena, MT?
The driving distance from Sidney, MT to Helena, MT is about 465 miles (748.3 km), with a travel time of about 07h 31m by car.
- The straight-line flight distance is about 378.1 miles (608.5 km).
- For a round trip, plan for roughly 15h 03m 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 07h 31m.
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.
Partly Sunny
Chance Light Rain then Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Sidney and Helena.
Turn-by-Turn Driving Directions
Step-by-step road directions between Sidney and Helena.
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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
-
7
Continue straight
112.8 mi · 1 hr 52 min
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8
Continue straight
7 mi · 7 min
-
9
Continue straight
57.8 mi · 59 min
-
10
Take the exit slight right toward US 287: Helena, Ennis
1498 ft · 37 sec
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11
Turn right onto Highway 287
63.5 mi · 1 hr 14 min · Highway 287
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12
Turn left onto North Montana Avenue
146 m · 18 sec · North Montana Avenue
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13
Turn right onto 11th Avenue
1.3 km · 2 min · 11th Avenue
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14
Turn right onto Cruse Avenue
50 m · 6 sec · Cruse Avenue
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15
Arrive at your destination
0 m · 1 sec · Cruse Avenue
Car Route Details
A richer read on the saved driving route between Sidney and Helena.
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.
Partly Sunny leaving Sidney and Chance Light Rain then Showers And Thunderstorms near Helena.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Sidney to Helena?
The road trip is about 465 miles (748.3 km) and usually takes 07h 31m 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 254.3 miles from Sidney and 210.7 miles from Helena.
How much longer is the road route than the straight-line distance?
The direct path is about 378.1 miles (608.5 km), while the road route adds roughly 86.9 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 $63.88 one way or $127.77 round trip. Estimated CO2 is about 145.8 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Sidney and Chance Light Rain then Showers And Thunderstorms near Helena.
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 Helena. Straight-line distance: 378.11 mi (608.51 km).
#1 Sidney
City in Montana, United States
| Population | 6,297 |
| Coordinates | 47.7166800, -104.1563300 |
| Altitude | 594 |
| Country | United States |
#2 Helena
State capital of Montana, United States and seat of Lewis and Clark County
| Population | 33,737 |
| Coordinates | 46.5927100, -112.0361100 |
| Altitude | 1237 |
| Country | United States |
End: Cruse Avenue (-112.036062, 46.592722)
Estimated Travel Time
Distance: 748 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 15h 29m |
| 40 mph (64.37 km/h) | 11h 37m |
| 50 mph (80.47 km/h) | 09h 17m |
| 60 mph (96.56 km/h) | 07h 44m |
| 70 mph (112.65 km/h) | 06h 38m |
| 80 mph (129 km/h) | 05h 48m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $63.88 | $127.77 |
| Mid-grade | $4.23 | $69.43 | $138.86 |
| Premium | $4.55 | $74.65 | $149.30 |
| Diesel | $5.41 | $88.81 | $177.62 |
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.