Distance between cities › USA › South Dakota › Harrison, SD › Distance from Harrison to Helmville Book Hotels

Distance from Harrison, SD to Helmville, MT

Distance

908 mi

Time

15 hours 41 mins

Gas Cost

$85 - $165

There are 741.07 miles from Harrison to Helmville in northwest direction and 908 miles (1,461.28 kilometers) by car, following the I-90 route.

Harrison and Helmville are 15 hours 41 mins far apart, if you drive non-stop .

This is the fastest route from Harrison, SD to Helmville, MT.

Please note the time difference between Harrison, SD and Helmville, MT is 1 hour. The current time in Harrison is 6:42 am and the current time in Helmville is 5:42 am.

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Lowest Price Rental Cars in Harrison, SD

Planning on renting a car to go from Harrison, SD to Helmville, MT? Here there are some offers to rent a car in Harrison, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Harrison »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 36.46 gallons of gas to cover the route between Harrison, SD and Helmville, MT.

The estimated cost of gas to go from Harrison to Helmville is $118.92.

During the route, an average car will release 714.26 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $3.26 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Harrison, SD and Helmville, MT

If you want to meet halfway between Harrison, SD and Helmville, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.566152 and -106.003303, or 45º 33' 58.1472" N, 106º 0' 11.8908" W. This location is 453.88 miles away from Harrison, SD and Helmville, MT and it would take approximately 7 hours 50 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Sonnette, MT, situated 458 miles from Harrison, SD and 471 miles from Helmville, MT. It would take 8 hours 32 mins to go from Harrison to Sonnette and 8 hours 32 mins to go from Helmville to Sonnette.