There are
2,118 mi
from Champaign, IL to Seatac, WA
That's the driving distance. It would take 1 day 12 hours to go from Champaign, Illinois to Seatac, Washington.
The flight distance (direct flight from Champaign, IL to Seatac, WA) is 1,757.98 mi.
2,118 mi = 3.22 kms