How far is Porcupine, SD from Watertown, SD?
The driving distance from Porcupine, SD to Watertown, SD is about 370.5 miles (596.3 km), with a travel time of about 06h 20m by car.
- The straight-line flight distance is about 283.1 miles (455.6 km).
- For a round trip, plan for roughly 12h 40m 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 20m.
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 Lyman County, South Dakota, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Rain Showers
Slight Chance Rain Showers then Cloudy
Driving Route Map
The map below follows the saved road route between Porcupine and Watertown.
Turn-by-Turn Driving Directions
Step-by-step road directions between Porcupine and Watertown.
-
1
Start on Eagle Drive
9 m · 2 sec · Eagle Drive
-
2
Turn right onto Main Street
38 m · 11 sec · Main Street
-
3
Turn left onto Big Foot Trail
14.6 mi · 35 min · Big Foot Trail
-
4
At the end of the road, turn left
48.1 mi · 57 min
-
5
Turn left onto State Highway 73
44.6 mi · 52 min · State Highway 73
-
6
Continue on SD Highway 73
1 mi · 2 min · SD Highway 73
-
7
Take the ramp right toward I 90 East
2008 ft · 49 sec
-
8
Merge slight left
199.1 mi · 3 hr 7 min
-
9
Take the exit slight right toward SD 25: Emery, Farmer
1688 ft · 48 sec
-
10
Turn left onto SD Highway 25
23.8 mi · 28 min · SD Highway 25
-
11
Turn right onto SD Highway 34
6 mi · 7 min · SD Highway 34
-
12
Turn left onto SD Highway 25
60 mi · 1 hr 11 min · SD Highway 25
-
13
At the end of the road, turn right onto US Highway 212
3.9 mi · 6 min · US Highway 212
-
14
Continue on 4th Street
1 mi · 2 min · 4th Street
-
15
Continue on US Highway 212
10.6 mi · 12 min · US Highway 212
-
16
Continue on 9th Avenue Southwest
6.4 mi · 9 min · 9th Avenue Southwest
-
17
Turn left onto South Broadway
1.1 km · 2 min · South Broadway
-
18
Arrive at your destination
0 m · 1 sec · South Broadway
Car Route Details
A richer read on the saved driving route between Porcupine and Watertown.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 90 East
Merge slight left
199 mi · 03h 07m
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.
Rain Showers leaving Porcupine and Slight Chance Rain Showers then Cloudy near Watertown.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Porcupine to Watertown?
The road trip is about 370.5 miles (596.3 km) and usually takes 06h 20m 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?
Reliance is a useful midpoint, sitting about 210 miles from Porcupine and 160.6 miles from Watertown.
How much longer is the road route than the straight-line distance?
The direct path is about 283.1 miles (455.6 km), while the road route adds roughly 87.4 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 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 $55.33 one way or $110.65 round trip. Estimated CO2 is about 116.2 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Porcupine and Watertown, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Rain Showers around Porcupine and Slight Chance Rain Showers then Cloudy near Watertown.
Flight Path Map
This map shows the direct air route between Porcupine and Watertown. Straight-line distance: 283.12 mi (455.64 km).
#1 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 |
#2 Watertown
City in and county seat of Codington County, South Dakota, United States
| Population | 22,303 |
| Coordinates | 44.8994100, -97.1150700 |
| Altitude | 528 |
| Country | United States |
End: South Broadway (-97.115008, 44.899398)
Estimated Travel Time
Distance: 596 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 12h 20m |
| 40 mph (64.37 km/h) | 09h 15m |
| 50 mph (80.47 km/h) | 07h 24m |
| 60 mph (96.56 km/h) | 06h 10m |
| 70 mph (112.65 km/h) | 05h 17m |
| 80 mph (129 km/h) | 04h 37m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.23 | $55.33 | $110.65 |
| Mid-grade | $4.46 | $58.28 | $116.56 |
| Premium | $5.05 | $66.02 | $132.03 |
| Diesel | $6.01 | $78.52 | $157.05 |
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