Sidney, MT to Butte, MT is 496.7 miles and takes about 8h 23m via I 90, I 94, and MT 16, with a fuel budget near $83 and enough daylight to finish in a day, though it's best as an overnight trip. This route traverses the Mountain West region, staying within Montana for its entirety. Given the substantial distance and duration, planning for at least one overnight stop is highly recommended to make the drive more manageable and enjoyable. You'll find this trip is primarily highway driving, making for relatively straightforward navigation.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
248.3 miles from Sidney, MT
A natural place for your longest stop of the day
, about 4h 14m into the drive
.
Main Roads
Road
Distance
Duration
I 90
231 mi
3h 50m
I 94
212.8 mi
3h 31m
MT 16
48.9 mi
55m
North Central Avenue
2.5 mi
2m
South Montana Street
0.5 mi
<1m
West 2nd Street
0.2 mi
<1m
South Main Street
0.2 mi
<1m
West Iron Street
<0.1 mi
<1m
Longest stretch:
I 90
— 231 mi, about 3h 50m
Traffic on I-90
Hour-of-day weekday pattern from 56 FHWA count stations on your route.
Peak
4 PM
~732 veh/hr typical
· worst 980
Quietest
2 AM
~43 veh/hr
Peak-to-quiet ratio
17×
busier at peak than in the quiet hours
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Averaged across 104 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Sidney, MT and Butte, MT.
1
Start on MT 16; MT 200
2.5 mi·2 min·North Central Avenue
2
Enter roundabout onto MT 16
135 ft·1 sec·MT 16
3
Continue on MT 16
49 mi·55 min·MT 16
4
Take the exit
0.3 mi·33 sec
5
Merge onto I 94
213 mi·3 hr 31 min·I 94
6
Merge onto I 90; US 87; US 212
2.8 mi·3 min·I 90; US 87; US 212
7
Continue on I 90; US 212
113 mi·1 hr 51 min·I 90; US 212
8
Continue on I 90; US 89; US 191
7.0 mi·6 min·I 90; US 89; US 191
9
Continue on I 90; US 191
108 mi·1 hr 48 min·I 90; US 191
Use the straight / slight right lanes.
10
Take the exit
0.3 mi·34 sec
Toward Montana Street
11
Turn right onto South Montana Street
0.5 mi·57 sec·South Montana Street
12
Turn right onto West 2nd Street
0.2 mi·37 sec·West 2nd Street
13
Turn left onto South Main Street
0.2 mi·27 sec·South Main Street
14
Turn left onto West Iron Street
70 ft·3 sec·West Iron Street
15
Arrive at destination
West Iron Street
Trip Plan
To make the most of this 496.7-mile drive, plan for an overnight stay to break up the 8h 23m estimated travel time. Consider leaving early in the morning to maximize daylight for your first day's driving, especially if you plan to stop around the halfway point. With a fuel cost estimated at $83, be mindful of gas station availability on the longer stretches, particularly the 231-mile segment on I-90. Keep an eye on your fuel gauge as you approach rural areas between towns.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
This drive is better paced as a 2-day trip.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 248.3 miles from Sidney, MT, or about 4h 14m into the drive.
The longest continuous stretch on this route runs about 231 miles.
Consider an overnight stop or starting very early.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 109 miles or 1h 56m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 248.3 miles or 4h 14m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Overnight split
Day 1 wrap after about 248.3 miles or 4h 14m
Stop before fatigue turns the last few hours into a grind. You want day two to start fresh, not just resumed.
Final approach
Final hour starts around 7h 21m
Traffic, exits, and arrival timing usually matter more near Butte, MT than in the middle of the route.
Before You Leave
+
Open the route before leaving Sidney, MT so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
+
Treat this as a 2-day road trip and book the overnight stop before the busiest arrival window.
Day 1
Settle into the route from Sidney, MT
Aim for roughly 248 miles and 4.2 hours of wheel time on this day.
Day 2
Finish the approach into Butte, MT
Aim for roughly 248 miles and 4.2 hours of wheel time on this day.
Your first comfortable stop window is around 109 miles from Sidney, MT.
This route usually feels better as a 2-day drive than as one long push.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on I 90 for about 231 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 9
5 decision points cluster between mile 2.5 and 496.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
2.5 mi into trip|~2m in|MT 16
Enter roundabout onto MT 16
Roundabout - know your exit number before entering
4
51.4 mi into trip|~58m in
Take the exit
Exit ramp - move to the correct lane early
4
495.4 mi into trip|~8h 20m in
Take the exit toward Montana Street
Exit ramp - move to the correct lane early
Toward Montana Street
5
496.5 mi into trip|~8h 22m in|South Main Street
Turn left onto South Main Street
Navigation decision point
5
496.7 mi into trip|~8h 23m in|West Iron Street
Turn left onto West Iron Street
Navigation decision point
Fuel & Cost
Regular Gas
$86.14 one way
$172.28 round trip
$4.41/gal25.4 MPG avg174 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.61
$90.09
$180.18
premium
$4.95
$96.80
$193.60
diesel
$5.60
$109.49
$218.98
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$86
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$216–$326
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 173.8 kg one way.
Prices: EIA weekly data, 2026-08-31.
Driving Electric?
About $52 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
149
1
$52.15
$23.84
Efficient EV
124.2
1
$43.46
$19.87
EV Truck/SUV
198.7
2
$69.54
$31.79
Gas CO2
174 kg
EV CO2
58 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Aug 15, 2026
Origin
Sidney, MT
Evening
in Sidney on Tuesday
Local time
8:55 PM
MDT
Current temp
52°F
Mostly Cloudy
NW 7 mph5% chanceLive forecast
Destination
Butte, MT
Evening
in Butte on Tuesday
Local time
8:55 PM
MDT
Current temp
46°F
Chance Showers And Thunderstorms then Partly Cloudy
SSE 3 mph33% chanceLive forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
For long drives, weather on day two can matter just as much as conditions at departure, so check the whole travel window rather than only the first day.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
6 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
8h 23m on the road
This is long enough that the arrival forecast matters almost as much as departure conditions. Recheck both ends before you roll.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
This drive is almost entirely highway, with 99% of the 496.7 miles on major roads like I-90 and I-94. You'll encounter a longest stretch of 231 miles on I-90, which means you can cover significant ground between services. Expect straightforward cruising for the vast majority of the trip, with minimal time on surface streets. The route's profile is mostly highway, so expect consistent speeds and fewer interruptions.
99% highway — fuel and pacing are the main things to plan.
15 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 231 mi on I 90.
How Hard Is This Drive?
4/10
This is a straightforward highway drive that stays mostly on I 90 and I 94. There are only a few real navigation decisions along the way. The trickiest moment comes around 2.5 miles in near MT 16.
Driving Effort4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
The route itself is not hard, but at 8h 23m, endurance matters. Plan breaks every 2-3 hours. The 9 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: at 2.5 miles (MT 16): Roundabout - know your exit number before entering; at 51.4 miles: Exit ramp - move to the correct lane early; at 495.4 miles: Exit ramp - move to the correct lane early.
Butte in southwest Montana, "The Richest Hill on Earth" from around 1880 to 1920, was the largest and most notorious copper boom town in the American West, home to hundreds of saloons and a famous red-light district. The city still flaunts its legacy of industry, wealth and squalor. As the sign along I-15 states:
"Butte has a most cosmopolitan population derived from the four corners of the world. She was a bold, unashamed, rootin', tootin' hell-roarin' camp in days gone by and still drinks her liquor straight."
Top landmarks
•Dumas Brothel — museum
•Butte-Anaconda Historic District — historic district in Montana, United States
•Matt's Place Drive-In — Baudenkmal und Drive-in-Restaurant in Butte im Silver Bow County, Montana
The longest stretch is about 231 miles on I 90. The full list of main roads is in the Roads section above.
Yes — a 2-day pace is more comfortable than one long haul. A sensible stopping point is after roughly 248 miles on day one.
Yes — we found about 15 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
It helps. This is a long drive, so arriving tired and in the dark compounds. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Butte, MT before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 2 meaningful breaks. There are 15 rest areas along the route for bathroom stops.
Mostly yes along the main roads, but rural stretches through MT can have sparse or no coverage. Before you leave, download offline Google Maps or Apple Maps for the route, and consider downloading music or podcasts instead of streaming. If you depend on data for navigation, keep a paper backup of the turn-by-turn directions.
The main spots that need attention: at 2.5 miles (MT 16): Roundabout - know your exit number before entering; at 51.4 miles: Exit ramp - move to the correct lane early; at 495.4 miles: Exit ramp - move to the correct lane early.
Not recommended in a single day. At 8.4 hours each way, a round trip means 16.8 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Butte, MT before the return drive.
