There are
2,862 mi
from Allentown, PA to Menlo Park, CA
That's the driving distance. It would take 2 days 2 hours to go from Allentown, Pennsylvania to Menlo Park, California.
The flight distance (direct flight from Allentown, PA to Menlo Park, CA) is 2,486.12 mi.
2,862 mi = 3.22 kms