St. Louis (STL) to Jacksonville (JAX): On-Time Performance
Data through July 2026
The calendar drives reliability on STL–JAX. October 2024 flights landed on schedule 97% of the time, but July 2026 dropped to 59% — a gap of 38 points. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 68%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 1.4
- last 12 months
- Duration
- 1h 58m
- scheduled
- Distance
- 753 mi
Monthly on-time trend
Best time to fly from STL to JAX
Aim for departures around 7 a.m. (96% on-time); avoid 8 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 14 min |
| Tuesday | 85% | 8 min |
| Wednesdaybest | 85% | 9 min |
| Thursday | 79% | 10 min |
| Friday | 82% | 12 min |
| Saturday | 79% | 15 min |
| Sunday | 73% | 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 aircraft48%
- Airline operations36%
- National airspace system14%
- Weather1%
- Security1%
Frequently asked questions
- How often are flights from STL to JAX delayed?
- 20% of STL–JAX 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 STL to JAX?
- Departures around 7 a.m. have the best record (96% on-time), while departures around 8 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to JAX?
- The scheduled STL–JAX flight time averages 1h 58m over 753 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are STL to JAX flights cancelled?
- 0.4% 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 STL to JAX?
- July 2026 was the roughest month in this dataset, with only 59% of arrivals on time. The best was October 2024 at 97%. If your dates are flexible, that 38-point gap is worth planning around.
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Based on 992 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.