There are
2,081 mi
from Lansing, IL to Seatac, WA
That's the driving distance. It would take 1 day 12 hours to go from Lansing, Illinois to Seatac, Washington.
The flight distance (direct flight from Lansing, IL to Seatac, WA) is 1,745.84 mi.
2,081 mi = 3,349.44 kms