Best Time to Fly STL to LGA: On-Time Stats by Hour & Airline
St Louis Lambert International → LaGuardia
Data through July 2026 · Last updated October 18, 2026
2,624 flights were scheduled from St. Louis (STL) to New York (LGA) in the last 12 months, and 74.9% of those that flew arrived on time, 2.7 points below the US average of 77.6%.
Republic Airways was the most punctual of the 2 airlines on the route at 80.3%, while Southwest Airlines trailed at 70.5%.
September has been the best month (92% on time) and Sunday the weakest day of the week (77%).
3.6% of flights were cancelled, versus 1.8% nationally.
STL to LGA 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 |
|---|---|---|---|---|
| Republic Airways | 80.3% | 84 min | 4.2% | 1,202 |
| Southwest Airlines | 70.5% | 57 min | 3.1% | 1,394 |
| SkyWest Airlines | Limited data | 28 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to LGA
On-time arrival % by scheduled departure hour (local time), 5,694 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.7% | 2.6% | 154 |
| 6am–7am | 91.9% | 1.9% | 698 |
| 7am–8am | 88.1% | 2.1% | 559 |
| 8am–9am | 96.1% | 1.5% | 130 |
| 9am–10am | 86.7% | 0.9% | 335 |
| 10am–11am | 84.9% | 1.7% | 356 |
| 11am–12pm | 79.3% | 2.8% | 510 |
| 12pm–1pm | 84.4% | 1.3% | 381 |
| 1pm–2pm | 78.7% | 3.4% | 320 |
| 2pm–3pm | 67.1% | 9.2% | 174 |
| 3pm–4pm | 75.0% | 4.9% | 554 |
| 4pm–5pm | 69.8% | 2.9% | 174 |
| 5pm–6pm | 69.2% | 4.7% | 385 |
| 6pm–7pm | 70.3% | 5.1% | 351 |
| 7pm–8pm | 65.9% | 3.8% | 391 |
| 8pm–9pm | 62.2% | 2.2% | 222 |
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 LGA
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) | 72.8% | -8.5 pts | 0.9% | 115 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.0% | -1.3 pts | 1.5% | 203 |
| Summer peak (Jun 15 - Aug 15) | 73.0% | -8.3 pts | 6.7% | 917 |
| All other days | 81.3% | — | 2.4% | 4,459 |
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).