How far is Gregory, SD from Rapid City, SD?
The driving distance from Gregory, SD to Rapid City, SD is about 242 miles (389.4 km), with a travel time of about 03h 47m by car.
- The straight-line flight distance is about 198.8 miles (319.9 km).
- For a round trip, plan for roughly 07h 34m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
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 03h 47m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
Township in Jones County, South Dakota
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Partly Sunny then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Gregory and Rapid City.
Turn-by-Turn Driving Directions
Step-by-step road directions between Gregory and Rapid City.
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1
Start on East 6th Street
1291 ft · 1 min · East 6th Street
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2
At the end of the road, turn left onto Park Avenue
1982 ft · 44 sec · Park Avenue
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3
Turn right onto US Highway 18
34.4 mi · 51 min · US Highway 18
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4
Turn right onto 307th Avenue
35.8 mi · 51 min · 307th Avenue
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5
Take the ramp left
1809 ft · 44 sec
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6
Merge slight left
168.6 mi · 2 hr 40 min
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7
Take the exit slight right toward I 190, US 16: Downtown, Black Hawk National Forest, Mount Rushmore
2265 ft · 1 min
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8
Continue straight
1.4 mi · 2 min
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9
Turn left onto Omaha Street
1148 ft · 39 sec · Omaha Street
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10
Turn right onto Mount Rushmore Road
1223 ft · 46 sec · Mount Rushmore Road
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11
Arrive at your destination
0 m · 1 sec · Mount Rushmore Road
Car Route Details
A richer read on the saved driving route between Gregory and Rapid City.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
307th Avenue
Merge slight left
169 mi · 02h 40m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Mostly Sunny leaving Gregory and Partly Sunny then Slight Chance Showers And Thunderstorms near Rapid City.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Gregory to Rapid City?
The road trip is about 242 miles (389.4 km) and usually takes 03h 47m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Okaton is a useful midpoint, sitting about 120.8 miles from Gregory and 121.1 miles from Rapid City.
How much longer is the road route than the straight-line distance?
The direct path is about 198.8 miles (319.9 km), while the road route adds roughly 43.2 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 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 9:26 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $32.20 one way or $64.41 round trip. Estimated CO2 is about 75.9 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Gregory and Rapid City, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Gregory and Partly Sunny then Slight Chance Showers And Thunderstorms near Rapid City.
Flight Path Map
This map shows the direct air route between Gregory and Rapid City. Straight-line distance: 198.8 mi (319.94 km).
#1 Gregory
City in Gregory County, South Dakota, United States
| Population | 1,250 |
| Coordinates | 43.2322200, -99.4303800 |
| Altitude | 661 |
| Country | United States |
#2 Rapid City
The second most populous city in South Dakota.
| Population | 77,503 |
| Coordinates | 44.0805400, -103.2310100 |
| Altitude | 988 |
| Country | United States |
End: Mount Rushmore Road (-103.231059, 44.080547)
Estimated Travel Time
Distance: 389 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 03m |
| 40 mph (64.37 km/h) | 06h 02m |
| 50 mph (80.47 km/h) | 04h 50m |
| 60 mph (96.56 km/h) | 04h 01m |
| 70 mph (112.65 km/h) | 03h 27m |
| 80 mph (129 km/h) | 03h 01m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $32.20 | $64.41 |
| Mid-grade | $4.25 | $36.32 | $72.64 |
| Premium | $4.65 | $39.75 | $79.49 |
| Diesel | $5.30 | $45.30 | $90.59 |
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.