About 2 hours
18 hours and 25 minutes IF you drive the speed limits and drive from the center of Chicago to the center of St Augustine.
1 hour
About 18 hours and 27 minutes.
approximately 635 miles
About an hour to two hours depending on your speed
Check on Google Maps
about 3 hours driving time
Fort Walton Beach to Saint Augustine is 365.89 miles and would take 5 hours and 50 minutes to drive. [Source: Mapquest]
It is 308.61 miles according to MapQuest.
12 hours 48 minutes
1 and a half hours by traveling the speed limit.