Miles between Seattle, WA and Thornton, CO

There are
1,294 mi
from Seattle, WA to Thornton, CO

That's the driving distance. It would take 22 hours 21 mins to go from Seattle, Washington to Thornton, Colorado.

The flight distance (direct flight from Seattle, WA to Thornton, CO) is 1,014.83 mi.

1,294 mi = 1.61 kms