How far is Rapid City, SD from Fort Thompson, SD?
The driving distance from Rapid City, SD to Fort Thompson, SD is about 213.4 miles (343.5 km), with a travel time of about 03h 35m by car.
- The straight-line flight distance is about 188.3 miles (303 km).
- For a round trip, plan for roughly 07h 11m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
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 35m.
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.
Town in South Dakota, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Rapid City and Fort Thompson.
Turn-by-Turn Driving Directions
Step-by-step road directions between Rapid City and Fort Thompson.
-
1
Start on Mount Rushmore Road
1223 ft · 48 sec · Mount Rushmore Road
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2
Turn left onto Omaha Street
1094 ft · 38 sec · Omaha Street
-
3
Turn right
1.2 mi · 2 min
-
4
Keep slight right to continue on I 90 East: Sioux Falls
1661 ft · 29 sec
-
5
Continue straight
190.8 mi · 3 hr 1 min
-
6
Take the exit slight right
1789 ft · 51 sec
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7
Turn left
1.3 km · 1 min
-
8
Continue straight
19.4 mi · 29 min
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9
Turn sharp right onto BIA Route 4
20 m · 2 sec · BIA Route 4
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10
Arrive at your destination
0 m · 1 sec · BIA Route 4
Car Route Details
A richer read on the saved driving route between Rapid City and Fort Thompson.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 90 East
Continue straight
191 mi · 03h 01m
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.
Sunny leaving Rapid City and Sunny near Fort Thompson.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Rapid City to Fort Thompson?
The road trip is about 213.4 miles (343.5 km) and usually takes 03h 35m 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?
Belvidere is a useful midpoint, sitting about 106.5 miles from Rapid City and 106.9 miles from Fort Thompson.
How much longer is the road route than the straight-line distance?
The direct path is about 188.3 miles (303 km), while the road route adds roughly 25.1 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 MDT. If you want a more comfortable same-day return, try to leave by 9:48 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $28.40 one way or $56.79 round trip. Estimated CO2 is about 66.9 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Rapid City and Fort Thompson, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Sunny around Rapid City and Sunny near Fort Thompson.
Flight Path Map
This map shows the direct air route between Rapid City and Fort Thompson. Straight-line distance: 188.28 mi (303 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 Fort Thompson
Census-designated place in Buffalo County, South Dakota, United States
| Population | 1,282 |
| Coordinates | 44.0686000, -99.4378800 |
| Altitude | 439 |
| Country | United States |
End: Fort Thompson (-99.43788, 44.0686)
Estimated Travel Time
Distance: 343 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 06m |
| 40 mph (64.37 km/h) | 05h 20m |
| 50 mph (80.47 km/h) | 04h 16m |
| 60 mph (96.56 km/h) | 03h 33m |
| 70 mph (112.65 km/h) | 03h 02m |
| 80 mph (129 km/h) | 02h 39m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $28.40 | $56.79 |
| Mid-grade | $4.25 | $32.03 | $64.05 |
| Premium | $4.65 | $35.04 | $70.09 |
| Diesel | $5.30 | $39.94 | $79.88 |
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 16, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.