Best time to visit Six Flags St Louis
Six Flags St Louis is quietest in September, averaging around 19% crowd levels in September. Tuesday is typically the calmest day of the week, at about 5%. Avoid September - September peaks near 19%.
Quietest month to visit
Quietest months to visit Six Flags St Louis
Crowd level by month
26 recorded days · % crowd level - how full the park was: queue length on one scale (50% is about a 17-minute queue) or, where it sells dated tickets, the share of capacity sold
September averages 19% crowd level at Six Flags St Louis - quieter - from 16 recorded days. That is exactly the typical month.
Open the September 2026 calendarSix Flags St Louis season by season
Which season to visit
Quietest is September to November at 19%
Spring. Six Flags St Louis has too few recorded operating days from March to May to rank the season honestly - usually a closed or reduced-hours period.
Summer. Six Flags St Louis has too few recorded operating days from June to August to rank the season honestly - usually a closed or reduced-hours period.
Autumn. September to November averages 19% crowd level at Six Flags St Louis, from 23 recorded days.
Winter. Six Flags St Louis has too few recorded operating days from December to February to rank the season honestly - usually a closed or reduced-hours period.
Quietest day of the week at Six Flags St Louis
Crowd level by day of the week
Averaged across 26 recorded days
- Mon25%
- Tue5%Quietest day of the week here
- Wed14%
- Thu5%
- Fri22%
- Sat40%
- Sun34%
Tuesday is the calmest day at Six Flags St Louis, averaging 5% against 40% on Saturday. Weekdays run 23 points below weekends.
How the Six Flags St Louis crowd figures are worked out
Every figure on this page comes from queue times recorded at Six Flags St Louis itself, sampled every few minutes across every ride the park publishes and stored day by day. A day's crowd score is that day's average wait expressed against this park's own busiest recorded day, so 100% means "as bad as it gets here" rather than "as bad as it gets anywhere" - a quiet day at a small park and a quiet day at Six Flags St Louis are not the same number of minutes, and scoring each park against itself is the only way the months stay comparable. Months with fewer than 10 recorded operating days are left unranked rather than averaged from a handful of days, and holidays, school terms and weather are all part of the model.
We publish how well those forecasts actually hold up: the crowd forecast accuracy ledger scores every past prediction against what the queues did on the day, versioned so you can see whether the model is getting better or worse. If you are choosing between parks rather than dates, the best time to visit a theme park guide covers the seasonal patterns that hold across every park we track, and the Six Flags St Louis crowd calendar gives you a day-by-day forecast for the specific dates you are considering. Always check the park's own site for opening hours and closures before travelling.
Frequently asked
When is the best time to visit Six Flags St Louis?
Weekdays in term-time are usually the quietest at Six Flags St Louis, with midweek (Tuesday-Thursday) typically calmer than weekends and school holidays. Arrive at opening to beat the longest queues.
What are the quietest days at Six Flags St Louis?
Midweek days outside school holidays are normally the quietest. Saturdays, Sundays and holiday periods see the biggest crowds.
Is Six Flags St Louis busy today?
Crowd levels change daily. See Six Flags St Louis's live crowd calendar for a day-by-day forecast and today's expected crowd level.
When does Six Flags St Louis get busiest?
Weekends, school holidays and major event days (e.g. public holidays and school breaks and seasonal events) are the busiest. Crowds also peak in the middle of the day.
What time should I arrive at Six Flags St Louis?
Arrive for opening. The first hour or two after the gates open reliably has the shortest queues of the day at Six Flags St Louis, whatever the season.
How long are the queues at Six Flags St Louis?
Queue lengths vary by ride, hour and season at Six Flags St Louis. The live queue times page shows what every ride is running right now.
Is it worth visiting Six Flags St Louis midweek?
Yes. Monday to Friday averages 14% crowd level at Six Flags St Louis against 37% at weekends - 23 points quieter - so a midweek day in term time is the single biggest saving available.