We booked them back to back for last spring. They'll hold a boat for you for 5 days while you look for fares. For our kids tix, we bought them in June 2014 for our March 2015 trip - $750 Columbus OH to STT. Never saw them go below that all year. In Dec 2014 we added in the fiancé to the trip -$950 for the same flight. Spring Break flights fill up. If you're working with a tight school vacation schedule I'd say get the flights first.