This 389.1-mile journey from Sioux Falls to Custer, South Dakota, is designed for a single day, taking approximately 6 hours and 30 minutes to complete. The route is predominantly highway-focused, with 96% of the drive on major roads, making it a straightforward trip. You'll primarily be on I 90, then transitioning to South Highway 16 and Highway 385. The estimated fuel cost for this drive is around $61, and with only one recommended stop, it’s a relatively uninterrupted travel experience. This trip is a solid option if you're looking for an efficient way to cover ground across the South Dakota landscape.
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
194.6 miles from Sioux Falls, SD
A natural place for your longest stop of the day
, about 3h 6m into the drive
.
Main Roads
Road
Distance
Duration
I 90
338.5 mi
5h 19m
South Highway 16
17.5 mi
21m
Highway 385
9.2 mi
13m
US Highway 16/385
6 mi
7m
North Elk Vale Road
5.4 mi
7m
I 229 Business
4.2 mi
5m
Catron Boulevard
2.2 mi
3m
East Main Street
1.4 mi
2m
Longest stretch:
I 90
— 338.5 mi, about 5h 19m
Turn-by-Turn Driving Directions
Step-by-step road directions between Sioux Falls, SD and Custer, SD.
1
Start on North Chicago Avenue
0.1 mi·29 sec·North Chicago Avenue
2
At end of road, turn left onto East 8th Street
0.2 mi·29 sec·East 8th Street
3
Turn right onto North Lowell Avenue
0.1 mi·19 sec·North Lowell Avenue
4
Turn left onto I 229 Business; SD 42
0.1 mi·24 sec·East 10th Street
5
Take the ramp onto I 229 Business
4.2 mi·5 min·I 229 Business
Use the straight / slight right lanes.
6
Take the exit
0.3 mi·45 sec
Toward I 90
7
Merge onto I 90
339 mi·5 hr 19 min·I 90
8
Take the exit
0.3 mi·35 sec
Toward US 16 Truck, ND 79 South: Mount Rushmore, Crazy Horse
9
Keep slight left at fork
0.2 mi·23 sec
10
Continue on US 16 Truck; SD 79
5.4 mi·7 min·North Elk Vale Road
11
Continue on US 16 Truck
1.2 mi·1 min·East Catron Boulevard
12
Continue on US 16 Truck
2.2 mi·3 min·Catron Boulevard
13
Turn left onto US 16
1.1 mi·1 min·Mount Rushmore Road
14
Continue on US 16
18 mi·21 min·South Highway 16
15
Continue on US 16
3.0 mi·4 min·Highway 385
16
Continue on US 16; US 385
1.4 mi·2 min·East Main Street
17
Continue on US 16; US 385
6.1 mi·8 min·Highway 385
18
Continue on US 16; US 385
6.0 mi·7 min·US Highway 16/385
19
Continue on US 16; US 385
1.1 mi·2 min·North 5th Street
20
Turn left onto US 16A; SD 89
421 ft·10 sec·Mount Rushmore Road
21
Arrive at destination
US 16A; SD 89
Trip Plan
To make the most of this 6-hour and 30-minute drive, consider an early morning departure from Sioux Falls to maximize daylight hours, especially if you plan to explore Custer upon arrival. The longest stretch without a significant road change is 338.5 miles on I 90, so plan your fuel and rest stops accordingly. While the route data suggests only one stop, you might want to break up the drive a bit more for comfort. Given the $61 fuel cost, ensure your tank is full before leaving Sioux Falls to avoid any unexpected detours for gas.
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 194.6 miles from Sioux Falls, SD, or about 3h 6m into the drive.
The longest continuous stretch on this route runs about 338.5 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 86 miles or 1h 24m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 194.6 miles or 3h 6m 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 14m
Traffic, exits, and arrival timing usually matter more near Custer, SD than in the middle of the route.
Before You Leave
+
Open the route before leaving Sioux Falls, 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 Sioux Falls, SD
This is one driving day of about 389.1 miles and 6h 30m.
Your first comfortable stop window is around 86 miles from Sioux Falls, 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 338.5 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 10
5 decision points cluster between mile 0.1 and 343.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0.1 mi into trip|~0m in|East 8th Street
At end of road, turn left onto East 8th Street
Complex interchange - multiple decisions in a short stretch
4
0.3 mi into trip|~0m in|North Lowell Avenue
Turn right onto North Lowell Avenue
Navigation decision point
4
0.5 mi into trip|~1m in|I 229 Business
Take the ramp onto I 229 Business
Lane positioning matters here
Use the straight / slight right lanes.
5
343.5 mi into trip|~5h 27m in
Take the exit toward US 16 Truck, ND 79 South: Mount Rushmore, Crazy Horse
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward US 16 Truck, ND 79 South: Mount Rushmore...
5
343.8 mi into trip|~5h 28m in
Keep slight left at fork
Highway fork - watch signs carefully
Fuel & Cost
Regular Gas
$60.83 one way
$121.66 round trip
$3.97/gal25.4 MPG avg136 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$66.79
$133.58
premium
$4.89
$74.88
$149.76
diesel
$5.61
$85.91
$171.82
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$61
Meals
$25–$50
Total
$86–$111
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 136.1 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $41 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
116.7
1
$40.86
$18.68
Efficient EV
97.3
1
$34.05
$15.56
EV Truck/SUV
155.6
1
$54.47
$24.90
Gas CO2
136 kg
EV CO2
46 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.
Forecast as of Apr 15, 2026
Origin
Sioux Falls, SD
Evening
in Sioux Falls on Saturday
Local time
8:08 PM
CDT
Current temp
47°F
Unavailable
Live forecast
Destination
Custer, SD
Evening
in Custer on Saturday
Local time
7:08 PM
MDT
Current temp
69°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
22 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
6h 30m 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.
National Parks Near This Route
Worth a detour if your schedule allows.
Mount Rushmore National Memorial
National Memorial
Majestic figures of George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln, surrounded by the beauty of the Black Hills of South Dakota, tell the story of the birth, growth, devel...
6 mi from route
~14 min detour
Free
near mile 362.3
Immerse yourself in one of the longest caves in the world. With over 220 miles of mapped and surveyed passages, this underground wilderness appeals to human curiosity. Its splendor is revealed through...
12 mi from route
~29 min detour
Free
near mile 389.1
Wind Cave National Park protects two very different worlds - one deep within the earth, the other a sunlit world of many resources. Bison, elk, and other wildlife roam the rolling prairie grasslands a...
15 mi from route
~38 min detour
Free
near mile 389.1
The rugged beauty of the Badlands draws visitors from around the world. These striking geologic deposits contain one of the world’s richest fossil beds. Ancient horses and rhinos once roamed here. The...
24 mi from route
~60 min detour
$30
near mile 295.2
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
Expect a highway-centric experience for most of this drive, with I 90 dominating the initial 338.5 miles. This means consistent speeds and a predictable road surface for the bulk of your journey. As you approach Custer, the landscape will shift as you transition to South Highway 16 and then Highway 385. While the majority of the drive is on interstates, the final legs offer a change of pace. This route is about covering distance efficiently, with the road primarily serving as a conduit across the Great Plains.
96% highway — fuel and pacing are the main things to plan.
21 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 338.5 mi on I 90.
How Hard Is This Drive?
3/10
This is a straightforward highway drive that stays mostly on I 90 and South Highway 16. There are only a few real navigation decisions along the way. The trickiest moment comes around 0.1 miles in near East 8th Street.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
The route itself is not hard, but at 6h 30m, endurance matters. Plan breaks every 2-3 hours. The 10 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: at 0.1 miles (East 8th Street): Complex interchange - multiple decisions in a short stretch; at 0.3 miles (North Lowell Avenue): Navigation decision point; at 0.5 miles (I 229 Business): Lane positioning matters here.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Sioux Falls, SD to Custer, SD, road signs begin pointing toward Crazy Horse along the way.
Sioux Falls is a city of about 184,000 (2019) in Southeast South Dakota. Founded in 1883 in what was then known as the Dakota Territory, Sioux Falls has grown from a sleepy Midwestern town into a resort for shopping and tourism in the northern Great Plains. It is widely recognized as the largest urban center between Minneapolis and Denver.
The longest stretch is about 338.5 miles on I 90. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
It helps. This is a long drive, so arriving tired and in the dark compounds. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Custer, SD before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
Mostly yes along the main roads, but rural stretches through SD can have sparse or no coverage. Before you leave, download offline Google Maps or Apple Maps for the route, and consider downloading music or podcasts instead of streaming. If you depend on data for navigation, keep a paper backup of the turn-by-turn directions.
The main spots that need attention: at 0.1 miles (East 8th Street): Complex interchange - multiple decisions in a short stretch; at 0.3 miles (North Lowell Avenue): Navigation decision point; at 0.5 miles (I 229 Business): Lane positioning matters here.
Yes — Mount Rushmore National Memorial, Jewel Cave National Monument and Wind Cave National Park (4 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 6.5 hours each way, a round trip means 13.0 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Custer, SD before the return drive.
