Best Time to Fly STL to JAX: On-Time Stats by Hour & Airline
St Louis Lambert International → Jacksonville International
Data through July 2026 · Last updated October 18, 2026
507 flights were scheduled from St. Louis (STL) to Jacksonville (JAX) in the last 12 months, and 78.5% of those that flew arrived on time, 0.8 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
November has been the best month (86% on time) and Sunday the weakest day of the week (73%).
0.2% of flights were cancelled, versus 1.8% nationally.
STL to JAX on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 78.5% | 55 min | 0.2% | 507 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to JAX
On-time arrival % by scheduled departure hour (local time), 957 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 95.6% | 0.0% | 91 |
| 8am–9am | 85.6% | 0.0% | 181 |
| 9am–10am | 85.7% | 0.0% | 49 |
| 10am–11am | 90.5% | 0.0% | 105 |
| 11am–12pm | Limited data | 9 | |
| 12pm–1pm | Limited data | 15 | |
| 1pm–2pm | 75.7% | 2.8% | 72 |
| 2pm–3pm | 90.5% | 0.0% | 42 |
| 3pm–4pm | 75.5% | 0.0% | 49 |
| 4pm–5pm | Limited data | 8 | |
| 5pm–6pm | Limited data | 21 | |
| 6pm–7pm | 74.5% | 0.0% | 51 |
| 7pm–8pm | 70.4% | 1.4% | 144 |
| 8pm–9pm | 66.3% | 0.0% | 98 |
| 9pm–10pm | Limited data | 22 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STL to JAX
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 18 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 81.0% | -0.2 pts | 0.0% | 42 |
| Summer peak (Jun 15 - Aug 15) | 74.8% | -6.4 pts | 0.5% | 199 |
| All other days | 81.2% | — | 0.4% | 698 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).