There are
2,577 mi
from Knoxville, TN to Seatac, WA
That's the driving distance. It would take 1 day 21 hours to go from Knoxville, Tennessee to Seatac, Washington.
The flight distance (direct flight from Knoxville, TN to Seatac, WA) is 2,107.95 mi.
2,577 mi = 3.22 kms