Six Flags Discovery Kingdom vs Six Flags Great America

Six Flags Discovery Kingdom sits in Vallejo, California, on San Francisco Bay's northern edge. The park combines a theme park with a marine-animal section, running coasters like Medusa (the West Coast's first floorless), Kong (an inverted coaster), Superman: Ultimate Flight, Joker 4-D Free Fly Coaster, and the newer DC Stunt Coaster. Dolphin, sea lion and bird shows run throughout the day.

Bay Area weekend visits, California school holidays, and the Fright Fest event drive Discovery Kingdom's peak crowds. Weekdays in April, September and October are dramatically quieter, with queue times on most rides staying short. Check live wait times for Medusa and Superman on arrival, and use our crowd calendar to pick a midweek date for shorter waits. The bayside setting makes for pleasant walking even on quieter days.

Six Flags Great America sits in Gurnee, Illinois, between Chicago and Milwaukee. The coaster line-up includes Maxx Force (with one of the world's fastest inversions), X Flight wing coaster, Goliath (a Rocky Mountain Construction wooden coaster), Raging Bull, American Eagle duelling wooden coaster, and Batman: The Ride. A Hurricane Harbor water park is included during summer.

Illinois and Wisconsin school holidays, Chicago-area weekend visits, and the popular Fright Fest event drive Six Flags Great America's busiest periods. Weekdays in May, June, September and October are dramatically quieter. Check live wait times for Maxx Force and Goliath on arrival, and use our crowd calendar to pick a lower-crowd midweek date for shorter queues.