Online purchase is $37 on site purchase price will be $45. You also have to pay for parking which is another$10.
Free of you have a 6 Flags season pass. Gold pass gets you entrance into any 6 Flags locations for free, you can get discounted passes at Costco, we got ours for $59.99 good for 2019. If you intend on going a lot buy the parking pass for $20. Free parking all year at all locations.
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