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

Distance from Armour, SD to SEA Airport

Distance

1,421 mi

Time

1 day

Gas Cost

$132 - $257

Helpful Inaccurate

There are 1,192.15 miles from Armour to Seattle–Tacoma International Airport (SEA) in northwest direction and 1,421 miles (2,286.88 kilometers) by car, following the I-90 route.

Armour and SEA Airport are 1 day far apart, if you drive non-stop .

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

Please note the time difference between Armour, SD and SEA Airport is 2 hours. The current time in Armour is 4:29 am and the current time in SEA Airport is 2:29 am.

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Lowest Price Rental Cars in Armour, SD

Planning on renting a car to go from Armour, SD to SEA Airport? Here there are some offers to rent a car in Armour, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Armour »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 57.06 gallons of gas to cover the route between Armour, SD and SEA Airport.

The estimated cost of gas to go from Armour to SEA Airport is $186.12.

During the route, an average car will release 1,117.85 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 Armour, SD and SEA Airport

If you want to meet halfway between Armour, 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 45.778072 and -110.190498, or 45º 46' 41.0592" N, 110º 11' 25.7928" W. This location is 710.35 miles away from Armour, SD and SEA Airport and it would take approximately 12 hours 24 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 749 miles from Armour, SD and 729 miles from SEA Airport. It would take 10 hours 43 mins to go from Armour to Springdale and 10 hours 23 mins to go from SEA to Springdale.