Origin
Tyndall, SD
Night in Tyndall on Sunday
Local time
9:48 PM
CDT
Current temp
41°F
Unavailable
Live forecast
Trip from Tyndall, SD to Spearfish, SD
Drive Time
6h 31m
Distance
375 mi
604 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$57
one way
EV Charging
Loading...
station data
Best Time to Leave
4 AM
6h 19m
★
6 AM
6h 31m
8 AM
6h 56m
10 AM
6h 40m
12 PM
6h 37m
3 PM
6h 41m
5 PM
6h 55m
8 PM
6h 24m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Tyndall, SD
Julio Lopez
Spearfish, SD
Wikimedia Commons
Trip Overview
Spanning 375 miles across the Great Plains, your journey from Tyndall to Spearfish is a significant cross-state haul that typically takes 6 hours and 31 minutes. You will primarily navigate via I-90, SD Highway 37, and SD Highway 50 to complete the transit. With a fuel budget of approximately $57, this route is best suited for a single, focused day of driving. While it is certainly possible to do this in one go, the duration makes it a substantial commitment behind the wheel. Given the distance, you should plan for at least one dedicated stop to stretch your legs and refuel. Whether you are aiming for an early start or a leisurely pace, keep in mind that the majority of your time will be spent on high-speed transit roads.
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
187.5 miles from Tyndall, SD
A natural place for your longest stop of the day , about 3h 29m into the drive .
Drive Character
This trip is heavily highway-focused, with 99% of your travel occurring on major thoroughfares. You should prepare for a consistent, high-speed pace, especially during the 319.5-mile stretch that keeps you locked onto I-90. While the initial segments involve state highways like SD-37 and SD-50, the character of the drive quickly shifts to the steady, repetitive rhythm of the interstate. You won't find many technical curves or complex navigation challenges here; instead, expect a straightforward, efficient drive that prioritizes speed over local scenery. It is a classic Great Plains transit route, offering a clear, predictable path from the southeastern corner of South Dakota all the way to the western edge.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 16 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 90 is the longest continuous segment at about 319.5 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 90 and SD Highway 37. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near Main Street.
Route Complexity
3/10
Easy - simple navigation with a manageable amount of wheel time
The route itself is not hard, but at 6h 31m, endurance matters. Plan breaks every 2-3 hours. The 7 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: near the start (Main Street): Navigation decision point; at 0.2 miles (West 20th Avenue): Navigation decision point; at 5.7 miles (SD 37 / SD Highway 37): Navigation decision point.
Critical Maneuvers
5 of 7 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
4
0 mi into trip
|
~0m in
|
Main Street
Turn left onto Main Street
Navigation decision point
4
0.2 mi into trip
|
~0m in
|
West 20th Avenue
Turn left onto West 20th Avenue
Navigation decision point
4
5.7 mi into trip
|
~10m in
|
SD 37 / SD Highway 37
Turn right onto SD 37 / SD Highway 37
Navigation decision point
5
54.6 mi into trip
|
~1h 23m in
|
I 90; SD 37
Merge onto I 90; SD 37
Merge point - match speed before joining. Lane positioning matters here
Use the none lane.
5
374.1 mi into trip
|
~6h 28m in
Take the exit toward Jackson Boulevard, Black Hills State University
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward Jackson Boulevard, Black Hills State Uni...
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 90 | 319.5 mi | 5h 4m |
| SD Highway 37 | 47.1 mi | 1h 10m |
| SD Highway 50 | 3.8 mi | 5m |
| 303rd Street | 1.3 mi | 3m |
| South Highway 37 | 1 mi | 1m |
| East Jackson Boulevard | 0.6 mi | 1m |
| West 20th Avenue | 0.5 mi | 1m |
| South Burr Street | 0.4 mi | <1m |
Longest stretch:
I 90
— 319.5 mi, about 5h 4m
Turn-by-Turn Driving Directions
Step-by-step road directions between Tyndall, SD and Spearfish, SD.
1
Start on West 18th Avenue
50 ft
·
7 sec
·
West 18th Avenue
2
Turn left onto Main Street
0.2 mi
·
30 sec
·
Main Street
3
Turn left onto West 20th Avenue
0.5 mi
·
1 min
·
West 20th Avenue
4
Continue on CR 303
1.3 mi
·
3 min
·
303rd Street
5
Turn right onto SD 37; SD 50
3.8 mi
·
5 min
·
SD Highway 50
6
Turn right onto SD 37
47 mi
·
1 hr 10 min
·
SD Highway 37
7
Continue on SD 37
1.0 mi
·
1 min
·
South Highway 37
8
Continue on SD 37
0.4 mi
·
34 sec
·
South Burr Street
9
Take the ramp
0.4 mi
·
52 sec
10
Merge onto I 90; SD 37
274 mi
·
4 hr 19 min
·
I 90; SD 37
Use the none lane.
11
Continue on I 90; US 14; SD 79
31 mi
·
31 min
·
I 90; US 14; SD 79
12
Continue on I 90; US 14; SD 34
14 mi
·
14 min
·
I 90; US 14; SD 34
13
Take the exit
0.3 mi
·
43 sec
Toward Jackson Boulevard, Black Hills State University
14
Turn left onto East Jackson Boulevard
0.6 mi
·
1 min
·
East Jackson Boulevard
15
Turn left onto I 90 Business
149 ft
·
14 sec
·
North Main Street
16
Arrive at destination
I 90 Business
Trip Plan
To tackle this 375-mile trip effectively, aim to depart early in the morning to avoid fatigue during the final leg of your journey. Since you have one planned stop, use that time to refuel and grab snacks so you can minimize time spent off the interstate. Because the longest stretch of the drive covers 319.5 miles on I-90, ensure your vehicle is prepped for sustained speeds before you leave Tyndall. Flexibility is your friend on a drive of this length, so keep an eye on your fuel gauge well before you hit that 319-mile interstate segment. By pacing your transit across the state, you can keep the drive manageable and arrive in Spearfish feeling refreshed rather than drained.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 187.5 miles from Tyndall, SD, or about 3h 29m into the drive.
The longest continuous stretch on this route runs about 319.5 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 83 miles or 1h 50m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 187.5 miles or 3h 29m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 29m
Traffic, exits, and arrival timing usually matter more near Spearfish, SD than in the middle of the route.
Before You Leave
+
Open the route before leaving Tyndall, SD 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 Tyndall, SD
This is one driving day of about 375 miles and 6h 31m.
Your first comfortable stop window is around 83 miles from Tyndall, SD.
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 I 90 for about 319.5 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 187.5 mi from Tyndall, SD · 3h 29m into the drive
Mid-route town
Meal stop
188 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 83 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 187.5 miles from Tyndall, SD, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel checkTop up before I 90 if your tank is already low. That segment runs about 319.5 miles.
Arriving in Spearfish, SD
The final approach into Spearfish, SD usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Spearfish, SD.
After long uninterrupted mileage, take five minutes before the last urban segment to reset and refocus on exits, merges, and city traffic.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$56.96 one way
$113.92 round trip
$3.86/gal
25.4 MPG avg
131 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.25 | $62.79 | $125.58 |
| premium | $4.80 | $70.79 | $141.58 |
| diesel | $5.64 | $83.31 | $166.62 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$57
Meals
$25–$50
Total
$82–$107
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 131.2 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $39 in charging · 1 stop · 66% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 112.5 | 1 | $39.38 | $18.00 |
| Efficient EV | 93.8 | 1 | $32.81 | $15.00 |
| EV Truck/SUV | 150 | 1 | $52.50 | $24.00 |
Gas CO2
131 kg
EV CO2
44 kg (66% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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.
Destination
Spearfish, SD
Evening in Spearfish on Sunday
Local time
8:48 PM
MDT
Current temp
40°F
Unavailable
Live forecast
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
1 hour earlier
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
1 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
6h 31m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Tyndall, SD to Spearfish, SD covers 375 miles and takes about 6h 31m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 90, SD Highway 37, SD Highway 50. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 187.5 miles from Tyndall, SD. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $56.96 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Start early — leave by 6-7 AM to arrive at a reasonable hour. This is a long drive — plan for a morning departure or consider splitting it into two days.
Plan about 1 meaningful break for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
The route itself is not hard, but at 6h 31m, endurance matters. Plan breaks every 2-3 hours. The 7 decision points are all manageable with basic attention.
The main spots that need attention: near the start (Main Street): Navigation decision point; at 0.2 miles (West 20th Avenue): Navigation decision point; at 5.7 miles (SD 37 / SD Highway 37): Navigation decision point.
The route from Tyndall, SD to Spearfish, SD does not surface many named destination signs beyond the main corridor.
Was this route helpful?
Thanks for your feedback!
Your tip has been submitted. Thanks!
/500
Recent Tips
·
Explore More
Continue From Spearfish, SD
More trips to Spearfish, SD
Explore more options from Tyndall, SD or browse trips ending in Spearfish, SD.
Looking for more statewide routes? Browse SD road trips.
Explore maps for Tyndall, SD or Spearfish, SD on MapSof.net.