Six Flags St Louis crowd calendar, September 2026
Six Flags St Louis is typically quiet in September 2026, averaging 27% crowd level. The quietest day is Tue 1 Sep at 5%, and the busiest is Sat 19 Sep at 60%.
Best day left in September
September 2026 is typically quiet at Six Flags St Louis, averaging 27% crowd level. The busiest is Saturday 19 Sept at 60%.
Six Flags St Louis is quiet today, at around 38% crowd levels, and moderately busy tomorrow. This weekend is looking moderately busy. Six Flags St Louis is typically quiet in September 2026, averaging around 27% crowd levels. The quietest day to visit is predicted to be Tuesday 1st (about 5%), while the busiest is Saturday 19th (about 60%). Weekdays are noticeably quieter than weekends, so a midweek visit means shorter queues.
Wondering how busy Six Flags St Louis will be in September 2026? This calendar predicts crowd levels day by day. The lower the score, the shorter the queues, so pick a quiet day and ride more.
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 15%Quietest | 25%Quietest | 35%Quietest | 45%Quietest | 55%Quietest | 65%Quietest | |
| 75%Quietest | 85%Quietest | 95%Quietest | 105%Quietest | 1138%*Typical | 1247%*Typical | 1343%*Typical |
| 1436%*Typical | 1534%*Quieter | 1632%*Quieter | 1733%*Quieter | 1847%*Typical | 1960%*Typical | 2051%*Typical |
| 2136%*Typical | 2240%*Typical | 2332%*Quieter | 2433%*Quieter | 2543%*Typical | 2653%*Typical | 2744%*Typical |
| 2826%*Quieter | 2917%*Quieter | 3018%*Quieter |
- Tue1Summer5%Quietest
- Wed2Summer5%Quietest
- Thu3Summer5%Quietest
- Fri4Summer5%Quietest
- Sat5Summer5%Quietest
- Sun6Summer5%Quietest
- Mon7Summer5%Quietest
- Tue8Summer5%Quietest
- Wed9Summer5%Quietest
- Thu10Summer5%Quietest
- Fri11Summer38%*Typical
- Sat12Summer47%*Typical
- Sun13Summer43%*Typical
- Mon1436%*Typical
- Tue1534%*Quieter
- Wed1632%*Quieter
- Thu1733%*Quieter
- Fri1847%*Typical
- Sat1960%*Typical
- Sun2051%*Typical
- Mon2136%*Typical
- Tue2240%*Typical
- Wed2332%*Quieter
- Thu2433%*Quieter
- Fri2543%*Typical
- Sat2653%*Typical
- Sun2744%*Typical
- Mon2826%*Quieter
- Tue2917%*Quieter
- Wed3018%*Quieter
Crowd levels are modelled from this park's own recorded queue times, school and public holidays, day of the week and the weather forecast, and may not always be right. Opening hours come from the park and can change. Always check the park's own site before travelling. We score every past forecast against what the queues actually did and publish the result in the crowd forecast accuracy ledger.
Frequently asked
How busy is Six Flags St Louis today?
Six Flags St Louis is predicted to be quiet today, at around 38% crowd levels. Lower percentages mean shorter queues.
How busy will Six Flags St Louis be tomorrow?
Six Flags St Louis is predicted to be moderately busy tomorrow, at around 47% crowd levels.
Is Six Flags St Louis busy this weekend?
This weekend Six Flags St Louis is looking moderately busy, at around 45% crowd levels on average.
When is the quietest day to visit Six Flags St Louis in September 2026?
Tuesday 1st is predicted to be the quietest day to visit Six Flags St Louis in September 2026, at around 5% crowd levels.
When is Six Flags St Louis busiest in September 2026?
Saturday 19th is predicted to be the busiest day at Six Flags St Louis in September 2026, at around 60% crowd levels.
How busy is Six Flags St Louis in September 2026?
On average, Six Flags St Louis is quiet in September 2026 - around 27% crowd levels. Weekdays are usually quieter than weekends.
Is Six Flags St Louis busier on weekends?
Yes - Six Flags St Louis is typically busier at weekends than midweek in September 2026. Visit on a weekday for shorter queues.
What is the best time to visit Six Flags St Louis?
The best time to visit Six Flags St Louis is on its quietest predicted days - Tuesday 1st is the quietest in September 2026 (about 5%). Arriving at opening also means the shortest waits.