Every day scored 1 to 10 for the next 120 days. Free, no sign-up, no email.
Quietest days coming up: Tue 25 Aug (3/10) · Tue 1 Sep (3/10) · Tue 8 Sep (3/10)
Busiest: Sat 28 Nov (10/10) — Thanksgiving weekend
June, July, August and October — the summer holiday and Fright Fest weekends.
May and September — May and September weekdays.
Local knowledge: Missouri humidity peaks mid-afternoon; the water rides here are a genuine part of the plan rather than an afterthought.
Each day starts from how that weekday normally runs at Six Flags St. Louis, learned from our own recorded wait snapshots as they accumulate, and is raised for public holidays and school-holiday periods. It is a forecast of relative busyness, not a promise: a 3 means a day that usually runs quiet for this park, not a guarantee of short lines. The further out a date sits, the more it leans on the weekday pattern alone.
Want the live picture instead? Six Flags St. Louis wait times has today's queues, the hour-by-hour curve and what counts as a normal wait here. Planning a specific day? Open the planner and it will build a route around these crowd levels.