There are
2,836 mi
from St Petersburg, FL to Walnut Creek, CA
That's the driving distance. It would take 2 days 2 hours to go from St Petersburg, Florida to Walnut Creek, California.
The flight distance (direct flight from St Petersburg, FL to Walnut Creek, CA) is 2,373.76 mi.
2,836 mi = 4,564.14 kms