How many miles from Florida's northern to southern border?

tho its southern border isn't quite so clear cut as its northern border

nevertheless

as the crow flies

the intervening distance can be as much as about 600 miles

if measured as extensively as possible

from the extreme northwest corner to the 3mile limit in the extreme southeast

or as little as about 400 miles

if measured as tightly as possible

from the southernmost point of Georgia to the southernmost point of dry land in the keys

&

the range of driving distances might vary just as considerably or even more so

depending again on the exact border points selected

but also on the choice of routing in this case as well

from a bare bones minimum of about 430 miles

to an extravagant maximum conceivably even beyond 800 miles