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Park Queue TimesPQT

Six Flags St Louis crowd predictor

September 2026Eureka, Missouri, United States

Six Flags St Louis is typically quiet in September, averaging 26% 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

Tuesday 29 Sept

September 2026 is typically quiet at Six Flags St Louis, averaging 26% crowd level. The busiest is Saturday 19 Sept at 60%.

17%crowds
Next bestWed 30 Sept 18%Mon 28 Sept 26%Sun 13 Sept 43%

Six Flags St Louis is quiet today, at around 21% crowd levels, and quiet tomorrow. This weekend is looking moderately busy.

This crowd predictor forecasts daily crowd levels for Six Flags St Louis through 2026.What the % means

The number is how full the park is: how long the queues run on its main rides in the middle of the day, on one scale for every park (50% is about a 17-minute queue, 70% half an hour, 90% an hour), or, where the park sells dated tickets, the share of its capacity sold if that is higher. The word beside it (Quietest to Busiest) compares the day with this park's own history, so a small park can be at its busiest on a day that is still short queues. The lower the number, the shorter the queues, so pick a quiet day and ride more.

Daily crowd levels and opening hours for Six Flags St Louis, September 2026
MonTueWedThuFriSatSun
15%Quietest25%Quietest35%Quietest45%Quietest55%Quietest11am - 8pm65%Quietest11am - 8pm
75%Quietest11am - 7pm8Closed9Closed10Closed11Closed1247%*Typical12pm - 11pm1343%*Typical12pm - 9pm
14Closed15Closed16Closed17Closed18Closed1960%*Typical12pm - 11pm2051%*Typical12pm - 9pm
21Closed22Closed23Closed24Closed2543%*Typical6pm - 11pm2653%*Typical12pm - 11pm2744%*Typical12pm - 9pm
2826%*Quieter2917%*Quieter3018%*Quieter
  1. Tue1Hours unavailableSummer5%Quietest
  2. Wed2Hours unavailableSummer5%Quietest
  3. Thu3Hours unavailableSummer5%Quietest
  4. Fri4Hours unavailableSummer5%Quietest
  5. Sat511am - 8pmSummer5%Quietest
  6. Sun611am - 8pmSummer5%Quietest
  7. Mon711am - 7pmSummer5%Quietest
  8. Tue8Hours unavailableSummerClosed
  9. Wed9Hours unavailableSummerClosed
  10. Thu10Hours unavailableSummerClosed
  11. Fri11Hours unavailableSummerClosed
  12. Sat1212pm - 11pmSummer47%*Typical
  13. Sun1312pm - 9pmSummer43%*Typical
  14. Mon14Hours unavailableClosed
  15. Tue15Hours unavailableClosed
  16. Wed16Hours unavailableClosed
  17. Thu17Hours unavailableClosed
  18. Fri18Hours unavailableClosed
  19. Sat1912pm - 11pm60%*Typical
  20. Sun2012pm - 9pm51%*Typical
  21. Mon21Hours unavailableClosed
  22. Tue22Hours unavailableClosed
  23. Wed23Hours unavailableClosed
  24. Thu24Hours unavailableClosed
  25. Fri256pm - 11pm43%*Typical
  26. Sat2612pm - 11pm53%*Typical
  27. Sun2712pm - 9pm44%*Typical
  28. Mon28Hours unavailable26%*Quieter
  29. Tue29Hours unavailable17%*Quieter
  30. Wed30Hours unavailable18%*Quieter
Quietest Among the quietest days at this parkQuieter Quieter than a normal day hereTypical A normal day for this parkBusier Busier than a normal day hereBusiest Among the busiest days at this park

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.

Seasonal events at Six Flags St Louis

  • Fright Fest runs 12 Sep to 1 Nov 2026, on Fridays to Sundays. Evening event.
  • Boo Fest (Kids Boo Fest) runs 12 Sep to 1 Nov 2026, on weekends.

Event nights are among the busiest of the season. See the crowd calendar before you book.

Dates as published by the park. Always check the park's own site before travelling.

September 2026October 2026

Frequently asked

How busy is Six Flags St Louis today?

Six Flags St Louis is predicted to be quiet today, at around 21% crowd levels. Lower percentages mean shorter queues.

How busy will Six Flags St Louis be tomorrow?

Six Flags St Louis is predicted to be quiet tomorrow, at around 38% 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 28% 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.

Is there a crowd predictor for Six Flags St Louis?

Yes. This page is a free Six Flags St Louis crowd predictor: it forecasts how busy every day will be through 2026, on a scale where 50% is about a 17-minute queue on the main rides and 90% is about an hour. The lower the number, the shorter the queues.

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