There are
2,701 mi
from Allentown, PA to Lemon Grove, CA
That's the driving distance. It would take 2 days to go from Allentown, Pennsylvania to Lemon Grove, California.
The flight distance (direct flight from Allentown, PA to Lemon Grove, CA) is 2,342.46 mi.
2,701 mi = 3.22 kms