Distance between cities › USA › Montana › Grass Range, MT › Distance from Grass Range to Seattle–Tacoma International Airport Book Hotels

Distance from Grass Range, MT to SEA Airport

Distance

784 mi

Time

14 hours 30 mins

Gas Cost

$72 - $140

Helpful Inaccurate

There are 633.37 miles from Grass Range to Seattle–Tacoma International Airport (SEA) in west direction and 784 miles (1,261.73 kilometers) by car, following the I-90 route.

Grass Range and SEA Airport are 14 hours 30 mins far apart, if you drive non-stop .

This is the fastest route from Grass Range, MT to SEA Airport. The halfway point is De Borgia, MT.

Please note the time difference between Grass Range, MT and SEA Airport is 1 hour. The current time in Grass Range is 9:24 pm and the current time in SEA Airport is 8:24 pm.

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Lowest Price Rental Cars in Grass Range, MT

Planning on renting a car to go from Grass Range, MT to SEA Airport? Here there are some offers to rent a car in Grass Range, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Grass Range »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 31.50 gallons of gas to cover the route between Grass Range, MT and SEA Airport.

The estimated cost of gas to go from Grass Range to SEA Airport is $100.92.

During the route, an average car will release 617.11 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 Grass Range, MT and SEA Airport

If you want to meet halfway between Grass Range, MT 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 47.345657 and -115.273346, or 47º 20' 44.3652" N, 115º 16' 24.0456" W. This location is 392.15 miles away from Grass Range, MT and SEA Airport and it would take approximately 7 hours 15 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is De Borgia, MT, situated 424 miles from Grass Range, MT and 396 miles from SEA Airport. It would take 6 hours 31 mins to go from Grass Range to De Borgia and 6 hours to go from SEA to De Borgia.