Ready to ride the Wonder Woman Golden Lasso at Six Flags Fiesta Texas? Groupon is offering a great deal on Six Flags Fiesta Texas tickets and a Book of Free! For only $99 you will get 4 Six Flags Fiesta Tickets and 1 Book of Free! The tickets will be valid 02/24/18 – 09/09/18. Please note that you will have to allow time for shipping. Use promo code QUICK20 for an extra 20% off though 06/05.