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

Distance from Armour, SD to Casper, WY

Distance

532 mi

Time

9 hours 22 mins

Gas Cost

$50 - $96

There are 403 miles from Armour to Casper in west direction and 532 miles (856.17 kilometers) by car, following the I-90 route.

Armour and Casper are 9 hours 22 mins far apart, if you drive non-stop .

This is the fastest route from Armour, SD to Casper, WY. The halfway point is Owanka, SD.

Please note the time difference between Armour, SD and Casper, WY is 1 hour. The current time in Armour is 9:19 am and the current time in Casper is 8:19 am.

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Lowest Price Rental Cars in Armour, SD

Planning on renting a car to go from Armour, SD to Casper, WY? 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 21.38 gallons of gas to cover the route between Armour, SD and Casper, WY.

The estimated cost of gas to go from Armour to Casper is $69.75.

During the route, an average car will release 418.95 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 Casper, WY

If you want to meet halfway between Armour, SD and Casper, WY or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.106052 and -102.659409, or 44º 6' 21.7872" N, 102º 39' 33.8724" W. This location is 266.23 miles away from Armour, SD and Casper, WY and it would take approximately 4 hours 41 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 289 miles from Casper, WY. It would take 3 hours 39 mins to go from Armour to Owanka and 4 hours 51 mins to go from Casper to Owanka.