How far is Helena, MT from Sidney, MT?
The driving distance from Helena, MT to Sidney, MT is about 465.1 miles (748.5 km), with a travel time of about 07h 27m by car.
- The straight-line flight distance is about 378.1 miles (608.5 km).
- For a round trip, plan for roughly 14h 54m 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 27m.
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.
Chance Light Rain then Showers And Thunderstorms
Partly Sunny
Driving Route Map
The map below follows the saved road route between Helena and Sidney.
Turn-by-Turn Driving Directions
Step-by-step road directions between Helena and Sidney.
-
1
Start on Cruse Avenue
50 m · 8 sec · Cruse Avenue
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2
Turn left onto 11th Avenue
1.4 mi · 4 min · 11th Avenue
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3
Turn straight onto Prospect Avenue
1.3 mi · 2 min · Prospect Avenue
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4
Continue straight
3.6 mi · 5 min
-
5
Continue straight
1678 ft · 26 sec
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6
Continue straight
30.2 mi · 34 min
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7
Continue straight
2.3 mi · 2 min
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8
Continue straight
1.2 mi · 1 min
-
9
Continue straight
1.4 mi · 2 min
-
10
Continue straight
22.7 mi · 24 min
-
11
Take the exit left toward I 90 East: Billings
1372 ft · 34 sec
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12
Merge slight left
180.8 mi · 3 hr 2 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 Helena 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.
Chance Light Rain then Showers And Thunderstorms leaving Helena 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 Helena to Sidney?
The road trip is about 465.1 miles (748.5 km) and usually takes 07h 27m 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 Helena and 210.8 miles from Sidney.
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 87 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 Chance Light Rain then Showers And Thunderstorms around Helena 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 Helena and Sidney. Straight-line distance: 378.11 mi (608.51 km).
#1 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 |
#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: 749 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 18m |
| 60 mph (96.56 km/h) | 07h 45m |
| 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 22, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.