How far is Medary, SD from Spearfish, SD?
The driving distance from Medary, SD to Spearfish, SD is about 428.9 miles (690.3 km), with a travel time of about 06h 08m by car.
- The straight-line flight distance is about 349.9 miles (563.1 km).
- For a round trip, plan for roughly 12h 17m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM CDT.
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 08m.
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.
Human settlement in Lyman County, South Dakota, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny then Slight Chance Showers And Thunderstorms
Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Medary and Spearfish.
Turn-by-Turn Driving Directions
Step-by-step road directions between Medary and Spearfish.
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1
Start on 471st Avenue
4 mi · 5 min · 471st Avenue
-
2
Turn left onto 223rd Street
1.4 mi · 3 min · 223rd Street
-
3
Take the ramp right
1333 ft · 33 sec
-
4
Merge slight left
37.1 mi · 35 min
-
5
Take the exit slight right toward Interstate 90 West: Rapid City
2517 ft · 1 min
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6
Merge slight left
383.8 mi · 6 hr 6 min
-
7
Take the exit slight right toward Jackson Boulevard, Black Hills State University
1541 ft · 43 sec
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8
Turn left onto East Jackson Boulevard
1 km · 2 min · East Jackson Boulevard
-
9
Turn left onto North Main Street
45 m · 14 sec · North Main Street
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10
Arrive at your destination
0 m · 1 sec · North Main Street
Car Route Details
A richer read on the saved driving route between Medary and Spearfish.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Interstate 90 West
Merge slight left
384 mi · 06h 06m
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.
Mostly Sunny then Slight Chance Showers And Thunderstorms leaving Medary and Showers And Thunderstorms near Spearfish.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Medary to Spearfish?
The road trip is about 428.9 miles (690.3 km) and usually takes 06h 08m 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?
Presho is a useful midpoint, sitting about 213.6 miles from Medary and 215.4 miles from Spearfish.
How much longer is the road route than the straight-line distance?
The direct path is about 349.9 miles (563.1 km), while the road route adds roughly 79 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 CDT. 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 $57.06 one way or $114.11 round trip. Estimated CO2 is about 134.5 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Medary and Spearfish, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Slight Chance Showers And Thunderstorms around Medary and Showers And Thunderstorms near Spearfish.
Flight Path Map
This map shows the direct air route between Medary and Spearfish. Straight-line distance: 349.87 mi (563.06 km).
#1 Medary
Township in Brookings County, South Dakota
| Population | 1,504 |
| Coordinates | 44.2096900, -96.7867200 |
| Altitude | 480 |
| Country | United States |
#2 Spearfish
City in Lawrence County, South Dakota, United States
| Population | 11,900 |
| Coordinates | 44.4908200, -103.8593700 |
| Altitude | 1112 |
| Country | United States |
End: North Main Street (-103.859247, 44.49086)
Estimated Travel Time
Distance: 690 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 14h 17m |
| 40 mph (64.37 km/h) | 10h 43m |
| 50 mph (80.47 km/h) | 08h 34m |
| 60 mph (96.56 km/h) | 07h 08m |
| 70 mph (112.65 km/h) | 06h 07m |
| 80 mph (129 km/h) | 05h 21m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $57.06 | $114.11 |
| Mid-grade | $4.25 | $64.35 | $128.70 |
| Premium | $4.65 | $70.42 | $140.83 |
| Diesel | $5.30 | $80.25 | $160.50 |
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 · May 30, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.