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

Distance from Armour, SD to Fairfield, MT

Distance

850 mi

Time

15 hours 12 mins

Gas Cost

$79 - $154

There are 722.95 miles from Armour to Fairfield in northwest direction and 850 miles (1,367.94 kilometers) by car, following the I-90 route.

Armour and Fairfield are 15 hours 12 mins far apart, if you drive non-stop .

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

Please note the time difference between Armour, SD and Fairfield, MT is 1 hour. The current time in Armour is 1:10 pm and the current time in Fairfield is 12:10 pm.

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Lowest Price Rental Cars in Armour, SD

Planning on renting a car to go from Armour, SD to Fairfield, 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 34.14 gallons of gas to cover the route between Armour, SD and Fairfield, MT.

The estimated cost of gas to go from Armour to Fairfield is $111.38.

During the route, an average car will release 668.95 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 Fairfield, MT

If you want to meet halfway between Armour, SD and Fairfield, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.419921 and -105.393179, or 45º 25' 11.7156" N, 105º 23' 35.4444" W. This location is 425.09 miles away from Armour, SD and Fairfield, MT and it would take approximately 7 hours 36 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Broadus, MT, situated 430 miles from Armour, SD and 420 miles from Fairfield, MT. It would take 7 hours 29 mins to go from Armour to Broadus and 7 hours 44 mins to go from Fairfield to Broadus.