There are
2,397 mi
from Harlingen, TX to Lake Stevens, WA
That's the driving distance. It would take 1 day 20 hours to go from Harlingen, Texas to Lake Stevens, Washington.
The flight distance (direct flight from Harlingen, TX to Lake Stevens, WA) is 2,001.80 mi.
2,397 mi = 3,858.02 kms