Miles between Thornton, CO and St Helens, OR

There are
1,261 mi
from Thornton, CO to St Helens, OR

That's the driving distance. It would take 21 hours 56 mins to go from Thornton, Colorado to St Helens, Oregon.

The flight distance (direct flight from Thornton, CO to St Helens, OR) is 991.15 mi.

1,261 mi = 1.61 kms