There are
1,949 mi
from Yakima, WA to Prospect Heights, IL
That's the driving distance. It would take 1 day 9 hours to go from Yakima, Washington to Prospect Heights, Illinois.
The flight distance (direct flight from Yakima, WA to Prospect Heights, IL) is 1,626.88 mi.
1,949 mi = 1.61 kms