Billings, MT to Sun Prairie, MT is 229.5 miles and takes about 4h 25m via US 87, US 12, and MT 3, with a fuel budget near $31 and enough daylight to finish in a day. This is a single-day trip that stays within the Mountain West region, primarily in Montana. Expect a straightforward drive with a high percentage of highway miles. It's a practical option if you're looking for an efficient way to cover this distance without needing an overnight stop.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
114.8 miles from Billings, MT
A natural place for your longest stop of the day
, about 2h 11m into the drive
.
Main Roads
Road
Distance
Duration
US 87
83.6 mi
1h 30m
US 12
45.1 mi
50m
MT 3
41.1 mi
47m
US 191
39.2 mi
42m
First Special Service Force Memorial Highway
5.5 mi
5m
2nd Avenue North
4.3 mi
7m
Iowa Avenue
2.5 mi
2m
North 27th Street
2.1 mi
3m
Longest stretch:
US 87
— 83.6 mi, about 1h 30m
Traffic on I-15
Hour-of-day weekday pattern from 8 FHWA count stations on your route.
Peak
5 PM
~393 veh/hr typical
· worst 526
Quietest
1 AM
~14 veh/hr
Peak-to-quiet ratio
28.1×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 103 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 Billings, MT and Sun Prairie, MT.
1
Start on I 90 Business
0.1 mi·25 sec·Montana Avenue
2
Turn left onto North 23rd Street
372 ft·21 sec·North 23rd Street
3
Turn left onto I 90 Business
0.3 mi·1 min·1st Avenue North
4
Turn right onto MT 3
2.1 mi·3 min·North 27th Street
Use the straight / right lanes.
5
Enter roundabout onto MT 3
236 ft·3 sec·MT 3
6
Continue on MT 3
3.1 mi·3 min·MT 3
7
Enter roundabout onto MT 3
144 ft·2 sec·MT 3
8
Continue on MT 3
25 mi·28 min·MT 3
9
Continue on MT-3
2.5 mi·2 min·Iowa Avenue
10
Continue on MT 3
12 mi·14 min·MT 3
11
At end of road, turn left onto US 12; MT 3
45 mi·50 min·US 12; MT 3
12
Turn right onto US 191; MT 3
39 mi·42 min·US 191; MT 3
13
At end of road, turn left onto US 87; MT 3; MT 200
64 mi·1 hr 9 min·US 87; MT 3; MT 200
14
Turn slight right
0.3 mi·20 sec
15
Enter roundabout
172 ft·2 sec
16
Continue
0.1 mi·7 sec
17
Continue on US 87; US 89; MT 3; MT 200
19 mi·20 min·US 87; US 89; MT 3; MT 200
18
Turn right onto US 87 Bypass
0.9 mi·1 min·57th Street South
19
Turn left onto 2nd Avenue North
4.3 mi·7 min·2nd Avenue North
20
At end of road, turn left onto I 15 Business
240 ft·4 sec·Park Drive North
21
Turn right onto I 15 Business
0.2 mi·23 sec·1st Avenue North
22
Continue on I 15 Business
0.2 mi·17 sec·First Avenue North Bridge
23
Continue on I 15 Business
1.4 mi·1 min·Central Avenue West
24
Take the exit onto I 15 Business
0.2 mi·32 sec·I 15 Business
25
Merge onto I 15; US 89; MT 200
5.5 mi·5 min·First Special Service Force Memorial Highway
26
Take the exit
0.2 mi·27 sec
27
Turn left onto North Manchester Road
0.2 mi·27 sec·North Manchester Road
28
At end of road, turn right onto Vaughn South Frontage Road
0.5 mi·54 sec·Vaughn South Frontage Road
29
Turn left onto South Manchester Road
0.5 mi·2 min·South Manchester Road
30
Turn right onto Manchester Lane
0.9 mi·3 min·Manchester Lane
31
Arrive at destination
Manchester Lane
Trip Plan
Given the 4h 25m estimated drive time, leaving Billings in the morning will allow you to reach Sun Prairie with plenty of daylight to spare. The single recommended stop is likely sufficient for this distance, but feel free to adjust based on your needs. Keep an eye on your fuel, as the longest stretch without services is over 80 miles. Planning your fuel stops around this long stretch on US 87 will be key to a smooth drive.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 114.8 miles from Billings, MT, or about 2h 11m into the drive.
The longest continuous stretch on this route runs about 83.6 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 50 miles or 59m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 114.8 miles or 2h 11m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 31m
Traffic, exits, and arrival timing usually matter more near Sun Prairie, MT than in the middle of the route.
Before You Leave
+
Open the route before leaving Billings, 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.
Day 1
Settle into the route from Billings, MT
This is one driving day of about 229.5 miles and 4h 25m.
Your first comfortable stop window is around 50 miles from Billings, MT.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on US 87 for about 83.6 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 19
5 decision points cluster between mile 0.2 and 219.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.2 mi into trip|~0m in|I 90 Business / 1st Avenue North
Turn left onto I 90 Business / 1st Avenue North
Navigation decision point
6
0.5 mi into trip|~1m in|MT 3 / North 27th Street
Turn right onto MT 3 / North 27th Street
Lane positioning matters here
Use the straight / right lanes.
5
46.2 mi into trip|~55m in|US 12; MT 3
At end of road, turn left onto US 12; MT 3
Navigation decision point
5
195.1 mi into trip|~3h 38m in
Enter roundabout
Roundabout - know your exit number before entering
5
219.7 mi into trip|~4h 9m in|I 15 Business / Park Drive North
At end of road, turn left onto I 15 Business / Park Drive North
Navigation decision point
Fuel & Cost
Regular Gas
$39.80 one way
$79.60 round trip
$4.41/gal25.4 MPG avg80 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.61
$41.63
$83.25
premium
$4.95
$44.73
$89.45
diesel
$5.60
$50.59
$101.18
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$40
Meals
$25–$50
Total
$65–$90
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 80.3 kg one way.
Prices: EIA weekly data, 2026-08-31.
Driving Electric?
About $24 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
68.9
0
$24.10
$11.02
Efficient EV
57.4
0
$20.08
$9.18
EV Truck/SUV
91.8
1
$32.13
$14.69
Gas CO2
80 kg
EV CO2
27 kg (66% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 16, 2026
Origin
Billings, MT
Night
in Billings on Saturday
Local time
10:01 PM
MDT
Current temp
57°F
Partly Cloudy
W 5 mph5% chanceLive forecast
Destination
Sun Prairie, MT
Night
in Sun Prairie on Saturday
Local time
10:01 PM
MDT
Current temp
48°F
Partly Cloudy
SSW 6 mph9% chanceLive forecast
43°F
Moore, MT
115 mi in
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.
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
9 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
4h 25m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
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 predominantly highway, with 91% of the route on major roads. You'll encounter a significant stretch of 83.6 miles on US 87 without needing to exit. The majority of the trip will feel like rural cruising. The transition from highway to surface roads will happen later in the route as you approach your destination.
91% highway — fuel and pacing are the main things to plan.
31 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 83.6 mi on US 87.
How Hard Is This Drive?
3/10
This is a straightforward highway drive that stays mostly on US 87 and US 12. There are only a few real navigation decisions along the way. The trickiest moment comes around 0.2 miles in near I 90 Business / 1st Avenue North.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 4h 25m drive. You will face about 19 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: at 0.2 miles (I 90 Business / 1st Avenue North): Navigation decision point; at 0.5 miles (MT 3 / North 27th Street): Lane positioning matters here; at 46.2 miles (US 12; MT 3): Navigation decision point.
Billings is the largest city in Montana in Yellowstone County, with an estimated 110,000 people (2019). As a destination, Billings does a significant amount of convention business and is also the host to various regional events such as music festivals, athletic contests, rodeos, and outdoor activities. Billings hosts the largest hospitals in a 500-mile radius, as such the medical profession is a major source of employment in the area. Billings is also a frequent overnight or meal stop for westbound visitors to Yellowstone National Park, as it is the last major city for visitors going to the park via the Beartooth Highway.
Top landmarks
•Masonic Temple — building in Billings, Montana
•United States Post Office and Courthouse–Billings — post office in Billings, United States of America
•Northern Hotel — historic hotel in Billings, Montana, United States
The longest stretch is about 83.6 miles on US 87. The full list of main roads is in the Roads section above.
Yes — we found about 2 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.
Yes, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
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 0.2 miles (I 90 Business / 1st Avenue North): Navigation decision point; at 0.5 miles (MT 3 / North 27th Street): Lane positioning matters here; at 46.2 miles (US 12; MT 3): Navigation decision point.
Possible but tiring. At 4.4 hours each way, an in-and-out day trip would put you behind the wheel for 8.8 hours — manageable with a long break at Sun Prairie, MT, but most travelers stay overnight.
