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

Distance from Armour, SD to Custer, SD

Distance

323 mi

Time

5 hours 37 mins

Gas Cost

$29 - $56

There are 264.82 miles from Armour to Custer in west direction and 323 miles (519.82 kilometers) by car, following the I-90 route.

Armour and Custer are 5 hours 37 mins far apart, if you drive non-stop .

This is the fastest route from Armour, SD to Custer, SD. The halfway point is Okaton, SD.

Please note the time difference between Armour, SD and Custer, SD is 1 hour. The current time in Armour is 10:03 am and the current time in Custer is 9:03 am.

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Lowest Price Rental Cars in Armour, SD

Planning on renting a car to go from Armour, SD to Custer, SD? 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 12.97 gallons of gas to cover the route between Armour, SD and Custer, SD.

The estimated cost of gas to go from Armour to Custer is $40.66.

During the route, an average car will release 254.11 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 $3.14 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Armour, SD and Custer, SD

If you want to meet halfway between Armour, SD and Custer, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.895412 and -100.961967, or 43º 53' 43.4832" N, 100º 57' 43.0812" W. This location is 161.48 miles away from Armour, SD and Custer, SD and it would take approximately 2 hours 48 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Okaton, SD, situated 156 miles from Armour, SD and 167 miles from Custer, SD. It would take 2 hours 15 mins to go from Armour to Okaton and 2 hours 28 mins to go from Custer to Okaton.