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Distance from Florence, MT to SEA Airport

Distance

499 mi

Time

9 hours 14 mins

Gas Cost

$47 - $90

Helpful Inaccurate

There are 391.43 miles from Florence to Seattle–Tacoma International Airport (SEA) in west direction and 499 miles (803.06 kilometers) by car, following the I-90 route.

Florence and SEA Airport are 9 hours 14 mins far apart, if you drive non-stop .

This is the fastest route from Florence, MT to SEA Airport. The halfway point is Sprague, WA.

Please note the time difference between Florence, MT and SEA Airport is 1 hour. The current time in Florence is 6:57 am and the current time in SEA Airport is 5:57 am.

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Lowest Price Rental Cars in Florence, MT

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

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Florence »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 20.05 gallons of gas to cover the route between Florence, MT and SEA Airport.

The estimated cost of gas to go from Florence to SEA Airport is $65.42.

During the route, an average car will release 392.90 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 Florence, MT and SEA Airport

If you want to meet halfway between Florence, 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 47.283520 and -118.044624, or 47º 17' 0.672" N, 118º 2' 40.6464" W. This location is 249.67 miles away from Florence, MT and SEA Airport and it would take approximately 4 hours 37 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Sprague, WA, situated 251 miles from Florence, MT and 250 miles from SEA Airport. It would take 3 hours 46 mins to go from Florence to Sprague and 3 hours 48 mins to go from SEA to Sprague.