How far is Spearfish, SD from Medary, SD?
The driving distance from Spearfish, SD to Medary, SD is about 428.5 miles (689.6 km), with a travel time of about 06h 54m by car.
- The straight-line flight distance is about 349.9 miles (563.1 km).
- For a round trip, plan for roughly 13h 48m 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 54m.
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.
Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Spearfish and Medary.
Turn-by-Turn Driving Directions
Step-by-step road directions between Spearfish and Medary.
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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
338.8 mi · 5 hr 20 min
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9
Take the exit slight right toward I 29: Fargo
1129 ft · 28 sec
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10
Merge slight left
37.5 mi · 35 min
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11
Take the exit slight right toward Nunda, Ward, Rest Area
1323 ft · 39 sec
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12
Turn left onto 223rd Street
1.5 mi · 4 min · 223rd Street
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13
Turn right onto 471st Avenue
4 mi · 5 min · 471st Avenue
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14
Arrive at your destination
0 m · 1 sec · 471st Avenue
Car Route Details
A richer read on the saved driving route between Spearfish and Medary.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 90 East
Continue straight
339 mi · 05h 20m
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.
Showers And Thunderstorms leaving Spearfish and Mostly Sunny then Slight Chance Showers And Thunderstorms near Medary.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Spearfish to Medary?
The road trip is about 428.5 miles (689.6 km) and usually takes 06h 54m 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 213.8 miles from Spearfish and 214.7 miles from Medary.
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 78.6 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 $57.02 one way or $114.04 round trip. Estimated CO2 is about 134.4 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Spearfish and Medary, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around Spearfish and Mostly Sunny then Slight Chance Showers And Thunderstorms near Medary.
Flight Path Map
This map shows the direct air route between Spearfish and Medary. Straight-line distance: 349.87 mi (563.06 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 Medary
Township in Brookings County, South Dakota
| Population | 1,504 |
| Coordinates | 44.2096900, -96.7867200 |
| Altitude | 480 |
| Country | United States |
End: Medary (-96.78672, 44.20969)
Estimated Travel Time
Distance: 690 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 14h 16m |
| 40 mph (64.37 km/h) | 10h 42m |
| 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 20m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $57.02 | $114.04 |
| Mid-grade | $4.25 | $64.31 | $128.61 |
| Premium | $4.65 | $70.37 | $140.74 |
| Diesel | $5.30 | $80.20 | $160.39 |
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.