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

Distance from Custer, SD to Oak Harbor, WA

Distance

1,224 mi

Time

22 hours 16 mins

Gas Cost

$114 - $222

There are 962.58 miles from Custer to Oak Harbor in northwest direction and 1,224 miles (1,969.84 kilometers) by car and ferry, following the I-90 route.

Custer and Oak Harbor are 22 hours 16 mins far apart, if you drive non-stop for 21 hours 56 mins and take a ferry for 20 minutes .

This is the fastest route from Custer, SD to Oak Harbor, WA. The halfway point is Deer Lodge, MT.

Please note the time difference between Custer, SD and Oak Harbor, WA is 1 hour. The current time in Custer is 9:35 am and the current time in Oak Harbor is 8:35 am.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to Oak Harbor, 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 49.17 gallons of gas to cover the route between Custer, SD and Oak Harbor, WA.

The estimated cost of gas to go from Custer to Oak Harbor is $160.38.

During the route, an average car will release 963.29 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 Oak Harbor, WA

If you want to meet halfway between Custer, SD and Oak Harbor, WA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 46.452007 and -112.728691, or 46º 27' 7.2252" N, 112º 43' 43.2876" W. This location is 612.13 miles away from Custer, SD and Oak Harbor, WA and it would take approximately 11 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 Deer Lodge, MT, situated 636 miles from Custer, SD and 616 miles from Oak Harbor, WA. It would take 9 hours 18 mins to go from Custer to Deer Lodge and 9 hours 32 mins to go from Oak Harbor to Deer Lodge.