Miles between Thornton, CO and Seaside, CA

There are
1,255 mi
from Thornton, CO to Seaside, CA

That's the driving distance. It would take 22 hours 37 mins to go from Thornton, Colorado to Seaside, California.

The flight distance (direct flight from Thornton, CO to Seaside, CA) is 939.73 mi.

1,255 mi = 1.61 kms