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

Distance from Custer, SD to Allen, SD

Distance

139 mi

Time

3 hours 17 mins

Gas Cost

$12 - $24

There are 90.38 miles from Custer to Allen in southeast direction and 139 miles (223.70 kilometers) by car, following the US-18 route.

Custer and Allen are 3 hours 17 mins far apart, if you drive non-stop .

This is the fastest route from Custer, SD to Allen, SD. The halfway point is Oglala, SD.

Custer, SD and Allen, SD are in the same time zone (MDT). Current time in both locations is 7:07 pm.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to Allen, 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 5.60 gallons of gas to cover the route between Custer, SD and Allen, SD.

The estimated cost of gas to go from Custer to Allen is $17.33.

During the route, an average car will release 109.63 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 Allen, SD

If you want to meet halfway between Custer, SD and Allen, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.188148 and -102.890739, or 43º 11' 17.3328" N, 102º 53' 26.6604" W. This location is 69.67 miles away from Custer, SD and Allen, SD and it would take approximately 1 hour 38 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Oglala, SD, situated 80 miles from Custer, SD and 59 miles from Allen, SD. It would take 1 hour 48 mins to go from Custer to Oglala and 1 hour 36 mins to go from Allen to Oglala.