Six Flags Ticket sales benefit the Northside Education Foundation. TICKETS AVAILABLE NOW! NEW Thrill Ride! 1-Day Ticket $ Purchase NEF ticket $33.00 Upgrade at the park $29.99 Tax $2.47 Season Pass after upgrade $65.46 A Savings of $15.72 Tickets on sale at Murnin Elementary Office February 20, 2015 - June 4, 2015 33 The NISD school that sells the most tickets by June 4th will receive $500 for their campus. Cash Only Six Flags Ticket sales benefit the Northside Education Foundation.