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

Distance from Custer, SD to Onalaska, WA

Distance

1,217 mi

Time

21 hours 38 mins

Gas Cost

$111 - $217

There are 948.84 miles from Custer to Onalaska in west direction and 1,217 miles (1,958.57 kilometers) by car, following the I-90 route.

Custer and Onalaska are 21 hours 38 mins far apart, if you drive non-stop .

This is the fastest route from Custer, SD to Onalaska, WA. The halfway point is Garrison, MT.

Please note the time difference between Custer, SD and Onalaska, WA is 1 hour. The current time in Custer is 11:45 pm and the current time in Onalaska is 10:45 pm.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to Onalaska, WA? 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 48.87 gallons of gas to cover the route between Custer, SD and Onalaska, WA.

The estimated cost of gas to go from Custer to Onalaska is $156.58.

During the route, an average car will release 957.45 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 Onalaska, WA

If you want to meet halfway between Custer, SD and Onalaska, WA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 46.578884 and -112.894981, or 46º 34' 43.9824" N, 112º 53' 41.9316" W. This location is 608.42 miles away from Custer, SD and Onalaska, WA and it would take approximately 10 hours 49 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Garrison, MT, situated 656 miles from Custer, SD and 631 miles from Onalaska, WA. It would take 9 hours 31 mins to go from Custer to Garrison and 9 hours 19 mins to go from Onalaska to Garrison.