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Distance between Keystone (South Dakota) and Hardin (Montana)

Driving non-stop from Keystone (South Dakota) to Hardin (Montana)

How far is Hardin (Montana) from Keystone (South Dakota)? Here's the quick answer if you are able to make this entire trip by car without stopping.

Nonstop drive: 348 miles or 560 km

Driving time: 5 hours, 29 minutes

Realistically, you'll probably want to add a buffer for rest stops, gas, or food along the way. To get a better idea of how long this trip would really be, scroll down to calculate how many hours it would take if you drive with stops.

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Flying non-stop from Keystone (South Dakota) to Hardin (Montana)

Now let's assume you have a private jet and you can fly in the fastest possible straight line between Keystone, South Dakota and Hardin, Montana. Because of the curvature of the Earth, the shortest distance is actually the "great circle" distance, or "as the crow flies" which is calculated using an iterative Vincenty formula.

Flight distance: 242 miles or 389 km

Flight time: 59 minutes

The straight line flight distance is 106 miles less than driving on roads, which means the driving distance is roughly 1.4x of the flight distance.

Your plane flies much faster than a car, so the flight time is about 1/6th of the time it would take to drive.

This is a relatively short flight in a private plane, but you might be planning to book a commercial flight. In that case, your travel time would really need to include how many minutes to get to your local airport, wait for security, board and taxi on the runway, land at the other airport, and get to your destination. Scroll down to see a more realistic calculation that takes into account all these factors to get a more accurate estimate of your actual flight time.

Keystone (South Dakota) to Hardin (Montana) road trip

Let's say you're actually planning a road trip to Hardin (Montana), and you want to stop along the way to rest. If it's a real road trip, you might want to check out interesting stops along the way, eat at great restaurants, and maybe even find a hotel to stay overnight. That's what Trippy is perfect for, helping you figure out travel plans in detail.

Based on the length of this trip, we think you could spread out this fun road trip over more than one day.

Road trip: 2 days of driving

With the full itinerary planned out, we can estimate your total travel time for this trip.

Travel time: 5.5 hours on the road with 1 overnight


Start in Keystone (South Dakota).

Drive for about 1 hour, then stop in Deadwood and stay for about 1 hour. Next, drive for another 1.5 hours then stop in Hammond. Stay overnight.

The next day, drive for about 2.5 hours, then stop at Little Bighorn Battlefield National Monument and stay for about 1 hour.

Finally, drive for about 29 minutes and arrive in Hardin (Montana).

To see all the details on this itinerary, including recommended restaurants, hotels, and things to do along the way, check out the full road trip planner:

Keystone (South Dakota) to Hardin (Montana) airports and flights

In the quick calculation above, we assumed you had a private plane and just wanted to know the time in the air from city to city. But for most of us, we're going to be flying on a commercial airline (whether it's first class or coach). So that means we really need to account for all the extra travel time getting to the airport, waiting for our flight, and making it to the destination.

To give you a better estimate of real-life travel, we've put together a flight itinerary with actual airports. Eventually you'll be able to customize this plan, choosing your own airports and flights. But for now, here's an example we've selected to give you an idea of how traveling might work between airports.

Departure airport: Rapid City Regional Airport (RAP)

Arrival airport: Billings Logan International Airport (BIL)

With the airports selected, we can estimate the travel time to and from the airport, based on how far the airport is from downtown.

Getting to the airport: 62 minutes

Getting to your destination: 136 minutes

Now finally, let's look at an example flight from RAP to BIL and figure out how long it would take to fly including take-off and landing, and time to taxi on the runway.

Commercial flight time: 59 minutes

So now we can finally get an idea of the total travel time from Keystone (South Dakota) to Hardin (Montana) including time spent getting to/from the airports, an estimated wait time of 2 hours at the airport for TSA security lines and waiting at the gate, and the actual flight itself.

Total travel time: 6 hours

To see the details on this flight plan, including recommended airports, airline, and route, check out the flight planner:

Plan a trip to Hardin (Montana)

Trippy has a ton of information that can help you plan your trip to Hardin, Montana. Start by reading the Trippy page on where to stay in Hardin (Montana). Check out some of the questions people have asked about Hardin (Montana) like lo Wyoming for Mount Rushmore, from there. Click the button below to explore Hardin (Montana) in detail.

How far is it the other way?

The distance is the same either way if you're flying a straight line (or driving the same roads back and forth). But for a real trip, there can be plenty of differences so go ahead and check the reverse directions to get the distance from Hardin (Montana) to Keystone (South Dakota), or go to the main page to calculate the distance between cities.

If you happen to know Keystone (South Dakota), don't forget to help other travelers and answer some questions about Keystone (South Dakota)!

At a Glance
without making any stops
total driving distance is 348 miles
driving time of 5 hours, 29 minutes
flight distance is 242 miles
flight time of 59 minutes
6 Keystone (South Dakota) travel answers
3 Hardin (Montana) travel answers

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