Best Time to Fly MSY to STL: On-Time Stats by Hour & Airline
Louis Armstrong New Orleans International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 81.8% of New Orleans (MSY) to St. Louis (STL) flights arrived on time (732 scheduled flights). That is 4.2 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
January has been the best month (93% on time) and Sunday the weakest day of the week (75%).
0.4% of flights were cancelled, versus 1.8% nationally.
MSY 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 | 81.8% | 50 min | 0.4% | 732 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MSY to STL
On-time arrival % by scheduled departure hour (local time), 1,461 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.0% | 0.0% | 40 |
| 6am–7am | 90.3% | 2.1% | 95 |
| 7am–8am | 95.5% | 0.9% | 424 |
| 8am–9am | 99.0% | 1.9% | 103 |
| 9am–10am | Limited data | 23 | |
| 10am–11am | Limited data | 8 | |
| 11am–12pm | 94.6% | 0.0% | 37 |
| 12pm–1pm | Limited data | 1 | |
| 1pm–2pm | 72.0% | 0.0% | 50 |
| 2pm–3pm | 72.9% | 0.0% | 59 |
| 3pm–4pm | Limited data | 16 | |
| 4pm–5pm | Limited data | 9 | |
| 5pm–6pm | 92.7% | 3.5% | 114 |
| 6pm–7pm | 68.3% | 0.9% | 226 |
| 7pm–8pm | 60.6% | 0.5% | 195 |
| 8pm–9pm | 66.1% | 1.6% | 61 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MSY 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 | 28 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 83.3% | -0.6 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 76.3% | -7.5 pts | 0.0% | 224 |
| All other days | 83.9% | — | 1.4% | 1,149 |
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).