Save on Six Flags' Opening WeekSix Flags over Texas opens for the season on Feb. 28, and the park is celebrating with its Spring Fever Pass. Purchase the pass by March 8 for $39.99, and you’ll get unlimited visits to the park through May 31. If you’re a Six Flags enthusiast, you know this is a great deal, since one-day passes during the regular season normally retail for $49.99. You can buy and print your Spring Fever pass here.