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

Distance from Custer, SD to Tumtum, WA

Distance

909 mi

Time

16 hours 8 mins

Gas Cost

$83 - $162

There are 734.18 miles from Custer to Tumtum in northwest direction and 909 miles (1,462.89 kilometers) by car, following the I-90 route.

Custer and Tumtum are 16 hours 8 mins far apart, if you drive non-stop .

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

Please note the time difference between Custer, SD and Tumtum, WA is 1 hour. The current time in Custer is 11:55 pm and the current time in Tumtum is 10:55 pm.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to Tumtum, 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 36.52 gallons of gas to cover the route between Custer, SD and Tumtum, WA.

The estimated cost of gas to go from Custer to Tumtum is $117.01.

During the route, an average car will release 715.50 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 Tumtum, WA

If you want to meet halfway between Custer, SD and Tumtum, WA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.687279 and -110.343262, or 45º 41' 14.2044" N, 110º 20' 35.7432" W. This location is 454.67 miles away from Custer, SD and Tumtum, WA and it would take approximately 8 hours 4 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Springdale, MT, situated 470 miles from Custer, SD and 469 miles from Tumtum, WA. It would take 7 hours 5 mins to go from Custer to Springdale and 6 hours 44 mins to go from Tumtum to Springdale.