Miles between Thornton, CO and Seattle, WA

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

That's the driving distance. It would take 22 hours 24 mins to go from Thornton, Colorado to Seattle, Washington.

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

1,294 mi = 1.61 kms