Best Time to Fly JAX to STL: On-Time Stats by Hour & Airline
Jacksonville International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 87.9% of Jacksonville (JAX) to St. Louis (STL) flights arrived on time (507 scheduled flights). That is 10.2 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (92% on time) and July the worst month (73%).
The cancellation rate was 0.6% (US average 1.8%).
JAX to STL 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 | 87.9% | 55 min | 0.6% | 507 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly JAX to STL
On-time arrival % by scheduled departure hour (local time), 958 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 6 | |
| 6am–7am | 94.5% | 2.7% | 75 |
| 7am–8am | 97.6% | 0.0% | 125 |
| 8am–9am | 97.1% | 0.6% | 173 |
| 9am–10am | Limited data | 1 | |
| 11am–12pm | 93.4% | 0.0% | 76 |
| 12pm–1pm | 89.8% | 1.7% | 60 |
| 1pm–2pm | 91.1% | 0.0% | 45 |
| 2pm–3pm | Limited data | 7 | |
| 3pm–4pm | Limited data | 24 | |
| 4pm–5pm | 56.8% | 0.0% | 44 |
| 5pm–6pm | 93.2% | 2.2% | 45 |
| 6pm–7pm | 86.7% | 0.0% | 90 |
| 7pm–8pm | 68.5% | 0.9% | 112 |
| 8pm–9pm | 68.0% | 0.0% | 75 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on JAX to STL
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) | 88.1% | -1.5 pts | 0.0% | 42 |
| Summer peak (Jun 15 - Aug 15) | 76.1% | -13.5 pts | 1.0% | 199 |
| All other days | 89.6% | — | 0.6% | 699 |
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).