What is the best way to travel?

Driving is the only practical option.

Is it a boring drive?

It is long and flat, but the Badlands are a great stop.

Keystone

Sioux Falls

Driving

Keystone to Sioux Falls

Updated: 28 May 2026

The journey from Keystone to Sioux Falls spans approximately 350 miles across the entire state of South Dakota. You will primarily travel on I-90 East, which is a straightforward interstate route. The drive takes about 5 to 6 hours. You will pass through the Badlands and the rolling prairies of the eastern part of the state.

Total Distance: 560 km driving, 530 km air distance.

Fastest Way

Driving takes about 5.5 hours.

Cheapest Way

Driving your own vehicle.

Compare Keystone to Sioux Falls Routes

Driving

Direct

Duration

5 hours 30 mins

Avg Price

$60-$100 in fuel

Operator

Personal Vehicle

Route

US-16 to I-90 E.

The drive is long and flat; use cruise control.

Travel Tips

Rest Stops
Use the well-maintained rest areas along I-90.
Fuel
Fill up in Rapid City or Chamberlain to avoid running low on the plains.
Speed
The speed limit on I-90 is 80 mph in many sections; stay alert.
Weather
Be prepared for high winds on the open prairie.
Navigation
I-90 is very easy to follow; you won't need complex directions.

Safety Tips

Fatigue
Take breaks every two hours to avoid driver fatigue on the long, straight road.
Wildlife
Watch for deer, especially near the Missouri River crossing.
Winter
I-90 can be dangerous during blizzards; check road reports.
Emergency
Cell service is generally good along the interstate.