There are
2,085 mi
from Walnut Creek, CA to Oswego, IL
That's the driving distance. It would take 1 day 11 hours to go from Walnut Creek, California to Oswego, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Oswego, IL) is 1,797.03 mi.
2,085 mi = 3,354.94 kms