There are
2,805 mi
from Vallejo, CA to Allentown, PA
That's the driving distance. It would take 2 days 1 hour to go from Vallejo, California to Allentown, Pennsylvania.
The flight distance (direct flight from Vallejo, CA to Allentown, PA) is 2,474.99 mi.
2,805 mi = 3.22 kms