Distance between cities › USA › South Dakota › Armour, SD › Distance from Armour to Ismay Book Hotels

Distance from Armour, SD to Ismay, MT

Distance

527 mi

Time

9 hours 53 mins

Gas Cost

$49 - $96

There are 384.26 miles from Armour to Ismay in northwest direction and 527 miles (848.12 kilometers) by car, following the I-90 route.

Armour and Ismay are 9 hours 53 mins far apart, if you drive non-stop .

This is the fastest route from Armour, SD to Ismay, MT.

Please note the time difference between Armour, SD and Ismay, MT is 1 hour. The current time in Armour is 10:07 am and the current time in Ismay is 9:07 am.

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Lowest Price Rental Cars in Armour, SD

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

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Armour »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 21.17 gallons of gas to cover the route between Armour, SD and Ismay, MT.

The estimated cost of gas to go from Armour to Ismay is $69.07.

During the route, an average car will release 414.82 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 Armour, SD and Ismay, MT

If you want to meet halfway between Armour, SD and Ismay, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.103618 and -102.6515, or 44º 6' 13.0248" N, 102º 39' 5.4" W. This location is 263.60 miles away from Armour, SD and Ismay, MT and it would take approximately 4 hours 56 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Owanka, SD, situated 255 miles from Armour, SD and 284 miles from Ismay, MT. It would take 4 hours 21 mins to go from Armour to Owanka and 6 hours to go from Ismay to Owanka.