How far is Sidney, MT from Lewistown, MT?
The driving distance from Sidney, MT to Lewistown, MT is about 270.5 miles (435.4 km), with a travel time of about 04h 21m by car.
- The straight-line flight distance is about 250.7 miles (403.4 km).
- For a round trip, plan for roughly 08h 43m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 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 04h 21m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
Mostly Cloudy
Sunny
Driving Route Map
The map below follows the saved road route between Sidney and Lewistown.
Turn-by-Turn Driving Directions
Step-by-step road directions between Sidney and Lewistown.
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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
1.4 mi · 1 min
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6
Take the exit slight right
1434 ft · 36 sec
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7
Turn right
217.9 mi · 3 hr 58 min
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8
Continue straight
23.8 mi · 28 min
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9
Turn left onto 6th Avenue South
121 m · 17 sec · 6th Avenue South
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10
Arrive at your destination
0 m · 1 sec · 6th Avenue South
Car Route Details
A richer read on the saved driving route between Sidney and Lewistown.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Longest stretch
Turn right
218 mi · 03h 58m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Mostly Cloudy leaving Sidney and Sunny near Lewistown.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Sidney to Lewistown?
The road trip is about 270.5 miles (435.4 km) and usually takes 04h 21m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Jordan is a useful midpoint, sitting about 147.2 miles from Sidney and 123.3 miles from Lewistown.
How much longer is the road route than the straight-line distance?
The direct path is about 250.7 miles (403.4 km), while the road route adds roughly 19.8 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 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 8:16 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $42.92 one way or $85.84 round trip. Estimated CO2 is about 84.9 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Cloudy around Sidney and Sunny near Lewistown.
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 Sidney and Lewistown. Straight-line distance: 250.66 mi (403.4 km).
#1 Sidney
City in Montana, United States
| Population | 6,297 |
| Coordinates | 47.7166800, -104.1563300 |
| Altitude | 594 |
| Country | United States |
#2 Lewistown
City in Montana, United States
| Population | 5,905 |
| Coordinates | 47.0624700, -109.4282400 |
| Altitude | 1203 |
| Country | United States |
End: 6th Avenue South (-109.428026, 47.06261)
Estimated Travel Time
Distance: 435 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 09h 00m |
| 40 mph (64.37 km/h) | 06h 45m |
| 50 mph (80.47 km/h) | 05h 24m |
| 60 mph (96.56 km/h) | 04h 30m |
| 70 mph (112.65 km/h) | 03h 51m |
| 80 mph (129 km/h) | 03h 22m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.49 | $42.92 | $85.84 |
| Mid-grade | $4.83 | $46.08 | $92.16 |
| Premium | $5.19 | $49.59 | $99.19 |
| Diesel | $6.11 | $58.35 | $116.70 |
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 · Oct 15, 2026