Distance between cities › USA › South Dakota › Custer, SD › Distance from Custer to Seattle–Tacoma International Airport Book Hotels

Distance from Custer, SD to SEA Airport

Distance

1,169 mi

Time

20 hours 38 mins

Gas Cost

$107 - $208

Helpful Inaccurate

There are 936.87 miles from Custer to Seattle–Tacoma International Airport (SEA) in northwest direction and 1,169 miles (1,881.32 kilometers) by car, following the I-90 route.

Custer and SEA Airport are 20 hours 38 mins far apart, if you drive non-stop .

This is the fastest route from Custer, SD to SEA Airport. The halfway point is Ramsay, MT.

Please note the time difference between Custer, SD and SEA Airport is 1 hour. The current time in Custer is 7:06 pm and the current time in SEA Airport is 6:06 pm.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to SEA Airport? 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 46.95 gallons of gas to cover the route between Custer, SD and SEA Airport.

The estimated cost of gas to go from Custer to SEA Airport is $150.43.

During the route, an average car will release 919.87 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 SEA Airport

If you want to meet halfway between Custer, SD and SEA Airport or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 46.055916 and -112.743980, or 46º 3' 21.2976" N, 112º 44' 38.328" W. This location is 584.54 miles away from Custer, SD and SEA Airport and it would take approximately 10 hours 19 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Ramsay, MT, situated 607 miles from Custer, SD and 592 miles from SEA Airport. It would take 8 hours 58 mins to go from Custer to Ramsay and 8 hours 34 mins to go from SEA to Ramsay.