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

Distance from Custer, SD to Billings, MT

Distance

345 mi

Time

6 hours 17 mins

Gas Cost

$32 - $61

There are 277.81 miles from Custer to Billings in northwest direction and 345 miles (555.22 kilometers) by car, following the I-90 route.

Custer and Billings are 6 hours 17 mins far apart, if you drive non-stop .

This is the fastest route from Custer, SD to Billings, MT. The halfway point is Buffalo, WY.

Custer, SD and Billings, MT are in the same time zone (MDT). Current time in both locations is 7:13 pm.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to Billings, MT? 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 13.85 gallons of gas to cover the route between Custer, SD and Billings, MT.

The estimated cost of gas to go from Custer to Billings is $44.38.

During the route, an average car will release 271.39 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 $3.20 per gallon of regular gas. Price last updated on March 11, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Custer, SD and Billings, MT

If you want to meet halfway between Custer, SD and Billings, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.206928 and -106.233925, or 44º 12' 24.9408" N, 106º 14' 2.13" W. This location is 172.46 miles away from Custer, SD and Billings, MT and it would take approximately 3 hours 8 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Buffalo, WY, situated 212 miles from Custer, SD and 164 miles from Billings, MT. It would take 3 hours 25 mins to go from Custer to Buffalo and 2 hours 33 mins to go from Billings to Buffalo.