How far is Spearfish, SD from Porcupine, SD?
The driving distance from Spearfish, SD to Porcupine, SD is about 131.6 miles (211.8 km), with a travel time of about 03h 40m by car.
- The straight-line flight distance is about 115.2 miles (185.4 km).
- For a round trip, plan for roughly 07h 21m 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 03h 40m.
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.
Human settlement in Pennington County, South Dakota, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Rain Showers
Driving Route Map
The map below follows the saved road route between Spearfish and Porcupine.
Turn-by-Turn Driving Directions
Step-by-step road directions between Spearfish and Porcupine.
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1
Start on North Main Street
26 m · 30 sec · North Main Street
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2
Continue on North Main Street
51 m · 10 sec · North Main Street
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3
Turn right onto East Jackson Boulevard
2777 ft · 2 min · East Jackson Boulevard
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4
Take the ramp right toward I 90 East, US 85 South
1555 ft · 38 sec
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5
Merge slight left
14.2 mi · 14 min
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6
Continue straight
7.6 mi · 8 min
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7
Continue straight
23.6 mi · 24 min
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8
Continue straight
2.1 mi · 2 min
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9
Take the exit slight right toward East North Street
1441 ft · 31 sec
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10
Keep slight right
689 ft · 16 sec
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11
Turn straight onto East North Street
1.6 km · 2 min · East North Street
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12
Turn left onto North Cambell Street
2343 ft · 1 min · North Cambell Street
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13
Turn left onto East Highway 44
40.3 mi · 1 hr 6 min · East Highway 44
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14
Turn right onto Main Street
2073 ft · 57 sec · Main Street
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15
Continue on Bombing Range Road
6.8 mi · 16 min · Bombing Range Road
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16
Continue on Big Foot Trail
7.9 mi · 19 min · Big Foot Trail
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17
Continue on Bureau of Indian Affairs Highway 27
6.8 mi · 16 min · Bureau of Indian Affairs Highway 27
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18
Continue on North Big Foot Trail
19.2 mi · 46 min · North Big Foot Trail
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19
Turn left onto Main Street
38 m · 9 sec · Main Street
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20
Turn left onto Eagle Drive
9 m · 1 sec · Eagle Drive
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21
Arrive at your destination
0 m · 1 sec · Eagle Drive
Car Route Details
A richer read on the saved driving route between Spearfish and Porcupine.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
East Highway 44
Turn left onto East Highway 44
40.3 mi · 01h 06m
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 Sunny leaving Spearfish and Rain Showers near Porcupine.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Spearfish to Porcupine?
The road trip is about 131.6 miles (211.8 km) and usually takes 03h 40m 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?
New Underwood is a useful midpoint, sitting about 65.7 miles from Spearfish and 65.9 miles from Porcupine.
How much longer is the road route than the straight-line distance?
The direct path is about 115.2 miles (185.4 km), while the road route adds roughly 16.4 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 9:38 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $19.64 one way or $39.28 round trip. Estimated CO2 is about 41.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Spearfish and Rain Showers near Porcupine.
Flight Path Map
This map shows the direct air route between Spearfish and Porcupine. Straight-line distance: 115.19 mi (185.38 km).
#1 Spearfish
City in Lawrence County, South Dakota, United States
| Population | 11,900 |
| Coordinates | 44.4908200, -103.8593700 |
| Altitude | 1112 |
| Country | United States |
#2 Porcupine
Situated on the Pine Ridge Indian Reservation in southwestern South Dakota, this census-designated place lies within Oglala Lakota County at an elevation of 3,192 feet.
| Population | 0 |
| Coordinates | 43.2397100, -102.3309900 |
| Altitude | 973 |
| Country | United States |
End: Porcupine (-102.33099, 43.23971)
Estimated Travel Time
Distance: 212 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 23m |
| 40 mph (64.37 km/h) | 03h 17m |
| 50 mph (80.47 km/h) | 02h 37m |
| 60 mph (96.56 km/h) | 02h 11m |
| 70 mph (112.65 km/h) | 01h 52m |
| 80 mph (129 km/h) | 01h 38m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.23 | $19.64 | $39.28 |
| Mid-grade | $4.46 | $20.69 | $41.38 |
| Premium | $5.05 | $23.44 | $46.87 |
| Diesel | $6.01 | $27.88 | $55.75 |
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 South Dakota · Oct 15, 2026