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

Distance from Armour, SD to Walnut, IA

Distance

256 mi

Time

4 hours 55 mins

Gas Cost

$24 - $46

There are 203.94 miles from Armour to Walnut in southeast direction and 256 miles (411.99 kilometers) by car, following the I-29 route.

Armour and Walnut are 4 hours 55 mins far apart, if you drive non-stop .

This is the fastest route from Armour, SD to Walnut, IA. The halfway point is Elk Point, SD.

Armour, SD and Walnut, IA are in the same time zone (CDT). Current time in both locations is 8:40 am.

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Lowest Price Rental Cars in Armour, SD

Planning on renting a car to go from Armour, SD to Walnut, IA? 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 10.29 gallons of gas to cover the route between Armour, SD and Walnut, IA.

The estimated cost of gas to go from Armour to Walnut is $33.56.

During the route, an average car will release 201.55 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 Walnut, IA

If you want to meet halfway between Armour, SD and Walnut, IA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 42.639610 and -96.632553, or 42º 38' 22.596" N, 96º 37' 57.1908" W. This location is 128.08 miles away from Armour, SD and Walnut, IA and it would take approximately 2 hours 27 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Elk Point, SD, situated 117 miles from Armour, SD and 135 miles from Walnut, IA. It would take 2 hours 31 mins to go from Armour to Elk Point and 2 hours 1 min to go from Walnut to Elk Point.