Six Flags – St. Louis Visit Holiday in the Park! Days of Operation: November 18-19, 22, 24-26 December 1-3, 8-10, 15-17, 22-23, 26-31 January 1, 2018 Tickets: $30.99 + Tax* Save over 50% off Main Gate Price. How to Receive Benefits By visiting www.sixflags.com/stlouis Entering MOSTATE in the promo code box at the top right Tickets valid at Six Flags St. Louis only. May not be combined with any other offer. *Please note there is a processing fee per online order.