Jacksonville (JAX) to St. Louis (STL): On-Time Performance
Data through July 2026
When you fly JAX to STL matters as much as anything else about the booking: the route swung from 95% on-time in September 2025 to just 63% in July 2024. Across the full period the route averages 86% on-time against a national 78%. Morning departures also hold up better than evening ones (96% vs 76%), which matters most in the rough months.
- On-time
- 86%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 1.4
- last 12 months
- Duration
- 2h 14m
- scheduled
- Distance
- 753 mi
Monthly on-time trend
Best time to fly from JAX to STL
Aim for departures around 7 a.m. (98% on-time); avoid 4 p.m. departures (51%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 16 min |
| Tuesdaybest | 92% | 8 min |
| Wednesday | 91% | 7 min |
| Thursday | 85% | 11 min |
| Friday | 83% | 14 min |
| Saturday | 89% | 12 min |
| Sunday | 81% | 13 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft60%
- Airline operations26%
- National airspace system7%
- Weather7%
Frequently asked questions
- How often are flights from JAX to STL delayed?
- 14% of JAX–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 12 minutes.
- What is the best time of day to fly from JAX to STL?
- Departures around 7 a.m. have the best record (98% on-time), while departures around 4 p.m. have the worst (51%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from JAX to STL?
- The scheduled JAX–STL flight time averages 2h 14m over 753 miles. Actual arrival times vary — flights on this route land 15+ minutes late 14% of the time.
- How often are JAX to STL flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from JAX to STL?
- July 2024 was the roughest month in this dataset, with only 63% of arrivals on time. The best was September 2025 at 95%. If your dates are flexible, that 32-point gap is worth planning around.
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Based on 993 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.