How far is New Underwood, SD from Keystone, SD?
The driving distance from New Underwood, SD to Keystone, SD is about 42.9 miles (69 km), with a travel time of about 00h 54m by car.
- The straight-line flight distance is about 32 miles (51.5 km).
- For a round trip, plan for roughly 01h 49m 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 54m.
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.
Census-designated place in Pennington County, South Dakota
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between New Underwood and Keystone.
Turn-by-Turn Driving Directions
Step-by-step road directions between New Underwood and Keystone.
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1
Start on South A Avenue
1084 ft · 32 sec · South A Avenue
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2
Turn right onto Highway 1416
1895 ft · 43 sec · Highway 1416
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3
Turn left onto 161st Avenue
3020 ft · 1 min · 161st Avenue
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4
Take the ramp left
1621 ft · 40 sec
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5
Merge slight left
15.9 mi · 16 min
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6
Take the exit slight right toward US 16 Truck, ND 79 South: Mount Rushmore, Crazy Horse
1470 ft · 36 sec
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7
Keep slight left
869 ft · 23 sec
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8
Continue on North Elk Vale Road
5.4 mi · 7 min · North Elk Vale Road
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9
Continue on East Catron Boulevard
1.2 mi · 2 min · East Catron Boulevard
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10
Continue on Catron Boulevard
2.2 mi · 3 min · Catron Boulevard
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11
Turn left onto Mount Rushmore Road
1.1 mi · 1 min · Mount Rushmore Road
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12
Continue on South Highway 16
12 mi · 14 min · South Highway 16
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13
Take the exit slight left
2.7 mi · 5 min
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14
Turn left onto Reed Street
1913 ft · 1 min · Reed Street
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15
Continue on 1st Street
155 m · 20 sec · 1st Street
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16
Turn right
28 m · 7 sec
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17
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between New Underwood and Keystone.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
161st Avenue
Merge slight left
15.9 mi · 00h 16m
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.
Sunny leaving New Underwood and Sunny near Keystone.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from New Underwood to Keystone?
The road trip is about 42.9 miles (69 km) and usually takes 00h 54m 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?
Rapid Valley is a useful midpoint, sitting about 21.4 miles from New Underwood and 21.4 miles from Keystone.
How much longer is the road route than the straight-line distance?
The direct path is about 32 miles (51.5 km), while the road route adds roughly 10.9 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 4:40 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.69 one way or $11.39 round trip. Estimated CO2 is about 13.4 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around New Underwood and Sunny near Keystone.
Stop Ideas Near Rapid Valley
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Willow Park
Box Elder City Hall
Box Elder Water Department
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Rapid Valley.
Flight Path Map
This map shows the direct air route between New Underwood and Keystone. Straight-line distance: 31.99 mi (51.49 km).
#1 New Underwood
Human settlement in Pennington County, South Dakota, United States of America
| Population | 679 |
| Coordinates | 44.0933200, -102.8362800 |
| Altitude | 867 |
| Country | United States |
#2 Keystone
Town in Pennington County, South Dakota
| Population | 352 |
| Coordinates | 43.8955400, -103.4182500 |
| Altitude | 1320 |
| Country | United States |
End: Keystone (-103.41825, 43.89554)
Estimated Travel Time
Distance: 69 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 25m |
| 40 mph (64.37 km/h) | 01h 04m |
| 50 mph (80.47 km/h) | 00h 51m |
| 60 mph (96.56 km/h) | 00h 42m |
| 70 mph (112.65 km/h) | 00h 36m |
| 80 mph (129 km/h) | 00h 32m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $5.69 | $11.39 |
| Mid-grade | $4.25 | $6.42 | $12.84 |
| Premium | $4.65 | $7.03 | $14.06 |
| Diesel | $5.30 | $8.01 | $16.02 |
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 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.