Miles between Thornton, CO and Marion, IL

There are
969 mi
from Thornton, CO to Marion, IL

That's the driving distance. It would take 17 hours 14 mins to go from Thornton, Colorado to Marion, Illinois.

The flight distance (direct flight from Thornton, CO to Marion, IL) is 874.95 mi.

969 mi = 1,559.82 kms