Distance between cities › USA › South Dakota › Dewey, SD › Distance from Dewey to Altamont Book Hotels

Distance from Dewey, SD to Altamont, SD

Distance

518 mi

Time

9 hours 11 mins

Gas Cost

$46 - $89

There are 375.15 miles from Dewey to Altamont in northeast direction and 518 miles (833.64 kilometers) by car, following the I-90 and US-14 route.

Dewey and Altamont are 9 hours 11 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Altamont, SD. The halfway point is Presho, SD.

Please note the time difference between Dewey, SD and Altamont, SD is 1 hour. The current time in Dewey is 12:18 am and the current time in Altamont is 1:18 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Altamont, SD? Here there are some offers to rent a car in Dewey, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Dewey »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 20.82 gallons of gas to cover the route between Dewey, SD and Altamont, SD.

The estimated cost of gas to go from Dewey to Altamont is $64.48.

During the route, an average car will release 407.90 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 $3.10 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Dewey, SD and Altamont, SD

If you want to meet halfway between Dewey, SD and Altamont, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.901829 and -100.056396, or 43º 54' 6.5844" N, 100º 3' 23.0256" W. This location is 259.21 miles away from Dewey, SD and Altamont, SD and it would take approximately 4 hours 35 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Presho, SD, situated 259 miles from Dewey, SD and 261 miles from Altamont, SD. It would take 4 hours 18 mins to go from Dewey to Presho and 3 hours 39 mins to go from Altamont to Presho.