How far is Rapid City, SD from Custer, SD?
The driving distance from Rapid City, SD to Custer, SD is about 40.9 miles (65.9 km), with a travel time of about 00h 57m by car.
- The straight-line flight distance is about 28.4 miles (45.7 km).
- For a round trip, plan for roughly 01h 55m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 00h 57m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 Pennington County, South Dakota
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny then Slight Chance Showers And Thunderstorms
Partly Sunny then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Rapid City and Custer.
Turn-by-Turn Driving Directions
Step-by-step road directions between Rapid City and Custer.
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1
Start on Mount Rushmore Road
5.7 mi · 9 min · Mount Rushmore Road
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2
Continue on South Highway 16
17.5 mi · 22 min · South Highway 16
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3
Continue on Highway 385
3 mi · 5 min · Highway 385
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4
Continue on East Main Street
1.4 mi · 3 min · East Main Street
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5
Continue on Highway 385
6.1 mi · 8 min · Highway 385
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6
Continue on US Highway 16/385
6 mi · 8 min · US Highway 16/385
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7
Continue on North 5th Street
1.1 mi · 3 min · North 5th Street
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8
Turn left onto Mount Rushmore Road
128 m · 10 sec · Mount Rushmore Road
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9
Arrive at your destination
0 m · 1 sec · Mount Rushmore Road
Car Route Details
A richer read on the saved driving route between Rapid City and Custer.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
South Highway 16
Continue on South Highway 16
17.5 mi · 00h 22m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Partly Sunny then Slight Chance Showers And Thunderstorms leaving Rapid City and Partly Sunny then Slight Chance Showers And Thunderstorms near Custer.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Rapid City to Custer?
The road trip is about 40.9 miles (65.9 km) and usually takes 00h 57m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Keystone is a useful midpoint, sitting about 20.4 miles from Rapid City and 20.5 miles from Custer.
How much longer is the road route than the straight-line distance?
The direct path is about 28.4 miles (45.7 km), while the road route adds roughly 12.5 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 8:00 AM to 10:00 AM MDT. If you want a more comfortable same-day return, try to leave by 4:34 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.47 one way or $10.94 round trip. Estimated CO2 is about 12.9 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny then Slight Chance Showers And Thunderstorms around Rapid City and Partly Sunny then Slight Chance Showers And Thunderstorms near Custer.
Flight Path Map
This map shows the direct air route between Rapid City and Custer. Straight-line distance: 28.38 mi (45.67 km).
#1 Rapid City
The second most populous city in South Dakota.
| Population | 77,503 |
| Coordinates | 44.0805400, -103.2310100 |
| Altitude | 988 |
| Country | United States |
#2 Custer
City in and county seat of Custer County, South Dakota, United States
| Population | 1,926 |
| Coordinates | 43.7666500, -103.5988100 |
| Altitude | 1620 |
| Country | United States |
End: Custer (-103.59881, 43.76665)
Estimated Travel Time
Distance: 66 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 21m |
| 40 mph (64.37 km/h) | 01h 01m |
| 50 mph (80.47 km/h) | 00h 49m |
| 60 mph (96.56 km/h) | 00h 40m |
| 70 mph (112.65 km/h) | 00h 35m |
| 80 mph (129 km/h) | 00h 30m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $5.47 | $10.94 |
| Mid-grade | $4.25 | $6.17 | $12.33 |
| Premium | $4.65 | $6.75 | $13.50 |
| Diesel | $5.30 | $7.69 | $15.38 |
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 · Apr 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.