Miles between Thornton, CO and Seatac, WA

There are
1,300 mi
from Thornton, CO to Seatac, WA

That's the driving distance. It would take 22 hours 34 mins to go from Thornton, Colorado to Seatac, Washington.

The flight distance (direct flight from Thornton, CO to Seatac, WA) is 1,009.93 mi.

1,300 mi = 1.61 kms