Best Time to Fly STL to FLL: On-Time Stats by Hour & Airline
St Louis Lambert International → Fort Lauderdale-Hollywood International
Data through July 2026 · Last updated October 18, 2026
828 flights were scheduled from St. Louis (STL) to Fort Lauderdale (FLL) in the last 12 months, and 74.3% of those that flew arrived on time, 3.3 points below the US average of 77.6%.
Southwest Airlines was the most punctual of the 2 airlines on the route at 74.7%, while Spirit Airlines trailed at 69.6%.
September has been the best month (87% on time) and Sunday the weakest day of the week (73%).
0.5% of flights were cancelled, versus 1.8% nationally.
STL to FLL 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 | 74.7% | 53 min | 0.4% | 766 |
| Spirit Airlines | 69.6% | 74 min | 1.7% | 58 |
| Frontier Airlines | Limited data | 4 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to FLL
On-time arrival % by scheduled departure hour (local time), 1,717 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.4% | 0.0% | 36 |
| 6am–7am | 91.7% | 0.0% | 60 |
| 7am–8am | 87.9% | 0.0% | 132 |
| 8am–9am | 87.6% | 0.0% | 178 |
| 9am–10am | 82.4% | 3.9% | 77 |
| 10am–11am | 83.0% | 0.6% | 161 |
| 11am–12pm | 70.9% | 0.0% | 56 |
| 12pm–1pm | 81.1% | 0.0% | 38 |
| 1pm–2pm | 56.4% | 0.0% | 55 |
| 2pm–3pm | 68.0% | 1.0% | 104 |
| 3pm–4pm | 77.8% | 0.0% | 45 |
| 4pm–5pm | 71.9% | 1.5% | 65 |
| 5pm–6pm | 77.9% | 2.0% | 148 |
| 6pm–7pm | 79.3% | 2.1% | 188 |
| 7pm–8pm | 69.8% | 0.6% | 173 |
| 8pm–9pm | 64.8% | 0.5% | 200 |
| 9pm–10pm | Limited data | 1 | |
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 FLL
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) | 70.7% | -9.2 pts | 0.0% | 41 |
| Christmas & New Year (Dec 20 - Jan 3) | 62.4% | -17.6 pts | 2.3% | 87 |
| Summer peak (Jun 15 - Aug 15) | 70.8% | -9.1 pts | 0.0% | 295 |
| All other days | 80.0% | — | 1.0% | 1,294 |
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).