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

Distance from Custer, SD to Altamont, SD

Distance

469 mi

Time

7 hours 52 mins

Gas Cost

$42 - $81

There are 349.49 miles from Custer to Altamont in northeast direction and 469 miles (754.78 kilometers) by car, following the I-90 and US-14 route.

Custer and Altamont are 7 hours 52 mins far apart, if you drive non-stop .

This is the fastest route from Custer, SD to Altamont, SD. The halfway point is Reliance, SD.

Please note the time difference between Custer, SD and Altamont, SD is 1 hour. The current time in Custer is 7:06 pm and the current time in Altamont is 8:06 pm.

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Lowest Price Rental Cars in Custer, SD

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

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Custer »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 18.84 gallons of gas to cover the route between Custer, SD and Altamont, SD.

The estimated cost of gas to go from Custer to Altamont is $58.35.

During the route, an average car will release 369.13 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 11, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Custer, SD and Altamont, SD

If you want to meet halfway between Custer, 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 43.872108 and -99.671066, or 43º 52' 19.5888" N, 99º 40' 15.8376" W. This location is 234.57 miles away from Custer, SD and Altamont, SD and it would take approximately 3 hours 56 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Reliance, SD, situated 234 miles from Custer, SD and 238 miles from Altamont, SD. It would take 3 hours 22 mins to go from Custer to Reliance and 3 hours 21 mins to go from Altamont to Reliance.