From now through November 16, 2014, you can use this coupon to get a whopping $20 off your full-price admission when you visit the park Monday through Friday!
Normally adult admission to Fiesta Texas is $64.99 per ticket, so you'd be dropping your price down to $44.99 each.
The coupon is good for up to four discount admissions per use. You will need to print the coupon in order to use it, as I don't think Fiesta Texas has the option to scan smartphones.
Print your Six Flags Fiesta Texas coupons here.
See more fun things to do with kids in San Antonio here.