How far is Great Falls, MT from Sidney, MT?
The driving distance from Great Falls, MT to Sidney, MT is about 375.9 miles (604.9 km), with a travel time of about 06h 08m by car.
- The straight-line flight distance is about 333 miles (535.9 km).
- For a round trip, plan for roughly 12h 16m 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 06h 08m.
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.
Town in and the county seat of Garfield County, Montana, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny then Showers And Thunderstorms Likely
Partly Sunny
Driving Route Map
The map below follows the saved road route between Great Falls and Sidney.
Turn-by-Turn Driving Directions
Step-by-step road directions between Great Falls and Sidney.
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1
Start on 4th Street South
49 m · 12 sec · 4th Street South
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2
Turn left onto 5th Avenue South
130 m · 21 sec · 5th Avenue South
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3
Turn right onto 5th Street South
1988 ft · 36 sec · 5th Street South
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4
Turn left onto 10th Avenue South
5.7 mi · 8 min · 10th Avenue South
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5
Continue straight
17.6 mi · 19 min
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6
Enter the roundabout and take exit 2 toward the route
68 m · 3 sec
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7
Exit the roundabout
1606 ft · 21 sec
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8
Turn straight
64.3 mi · 1 hr 10 min
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9
Continue straight
14.7 mi · 16 min
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10
Turn straight onto Truck Bypass
2.6 mi · 4 min · Truck Bypass
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11
Continue on 1st Avenue North
1629 ft · 37 sec · 1st Avenue North
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12
Turn left onto East Main Street
1946 ft · 1 min · East Main Street
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13
Continue on Northeast Main Street
1.1 mi · 2 min · Northeast Main Street
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14
Continue on US Highway 87
196.5 mi · 3 hr 35 min · US Highway 87
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15
Continue straight
43.4 mi · 47 min
-
16
Continue straight
159 m · 15 sec
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17
Take the ramp left
1186 ft · 29 sec
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18
Merge slight left
1.3 mi · 1 min
-
19
Take the exit slight right toward MT 16: Glendive, Sidney
1422 ft · 38 sec
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20
Turn left
49 mi · 56 min
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21
Enter the roundabout and take exit 2 toward South Central Avenue
40 m · 2 sec · South Central Avenue
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22
Exit the roundabout onto South Central Avenue
2.5 mi · 3 min · South Central Avenue
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23
Arrive at your destination
0 m · 1 sec · North Central Avenue
Car Route Details
A richer read on the saved driving route between Great Falls and Sidney.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
US Highway 87
Continue on US Highway 87
196 mi · 03h 35m
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 then Showers And Thunderstorms Likely leaving Great Falls 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 Great Falls to Sidney?
The road trip is about 375.9 miles (604.9 km) and usually takes 06h 08m 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?
Jordan is a useful midpoint, sitting about 200 miles from Great Falls and 175.9 miles from Sidney.
How much longer is the road route than the straight-line distance?
The direct path is about 333 miles (535.9 km), while the road route adds roughly 42.9 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 $51.62 one way or $103.24 round trip. Estimated CO2 is about 117.8 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny then Showers And Thunderstorms Likely around Great Falls and Partly Sunny near Sidney.
Stop Ideas Near Jordan
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 Jordan.
Glasgow
Flight Path Map
This map shows the direct air route between Great Falls and Sidney. Straight-line distance: 333.02 mi (535.95 km).
#1 Great Falls
Town in Cascade County, Montana, United States
| Population | 58,353 |
| Coordinates | 47.5002400, -111.3008100 |
| Altitude | 1015 |
| 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: 605 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 12h 31m |
| 40 mph (64.37 km/h) | 09h 23m |
| 50 mph (80.47 km/h) | 07h 31m |
| 60 mph (96.56 km/h) | 06h 15m |
| 70 mph (112.65 km/h) | 05h 22m |
| 80 mph (129 km/h) | 04h 41m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $51.62 | $103.24 |
| Mid-grade | $4.23 | $56.10 | $112.21 |
| Premium | $4.55 | $60.32 | $120.64 |
| Diesel | $5.41 | $71.76 | $143.53 |
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.