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

Distance from Custer, SD to Mammoth, PA

Distance

1,454 mi

Time

1 day 1 hour

Gas Cost

$135 - $263

There are 1,259.10 miles from Custer to Mammoth in east direction and 1,454 miles (2,339.99 kilometers) by car, following the I-90 and US-14 route.

Custer and Mammoth are 1 day 1 hour far apart, if you drive non-stop .

This is the fastest route from Custer, SD to Mammoth, PA.

Please note the time difference between Custer, SD and Mammoth, PA is 2 hours. The current time in Custer is 4:38 am and the current time in Mammoth is 6:38 am.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to Mammoth, PA? 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 58.39 gallons of gas to cover the route between Custer, SD and Mammoth, PA.

The estimated cost of gas to go from Custer to Mammoth is $190.45.

During the route, an average car will release 1,143.88 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 Custer, SD and Mammoth, PA

If you want to meet halfway between Custer, SD and Mammoth, PA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.94319 and -90.758296, or 43º 56' 35.484" N, 90º 45' 29.8656" W. This location is 726.89 miles away from Custer, SD and Mammoth, PA and it would take approximately 12 hours 59 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Sparta, WI, situated 697 miles from Custer, SD and 758 miles from Mammoth, PA. It would take 12 hours to go from Custer to Sparta and 14 hours 5 mins to go from Mammoth to Sparta.