There are
1,964 mi
from Redwood City, CA to Harlingen, TX
That's the driving distance. It would take 1 day 10 hours to go from Redwood City, California to Harlingen, Texas.
The flight distance (direct flight from Redwood City, CA to Harlingen, TX) is 1,631.06 mi.
1,964 mi = 3,161.36 kms