There are
1,985 mi
from The Dalles, OR to Sycamore, IL
That's the driving distance. It would take 1 day 9 hours to go from The Dalles, Oregon to Sycamore, Illinois.
The flight distance (direct flight from The Dalles, OR to Sycamore, IL) is 1,628.18 mi.
1,985 mi = 3,195.30 kms