Best Time to Fly STL to LAX: On-Time Stats by Hour & Airline
St Louis Lambert International → Los Angeles International
Data through July 2026 · Last updated October 18, 2026
1,027 flights were scheduled from St. Louis (STL) to Los Angeles (LAX) in the last 12 months, and 73.4% of those that flew arrived on time, 4.2 points below the US average of 77.6%.
SkyWest Airlines was the most punctual of the 2 airlines on the route at 74.6%, while Southwest Airlines trailed at 72.8%.
November has been the best month (85% on time) and Monday the weakest day of the week (68%).
0.3% of flights were cancelled, versus 1.8% nationally.
STL to LAX 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 |
|---|---|---|---|---|
| SkyWest Airlines | 74.6% | 79 min | 0.8% | 354 |
| Southwest Airlines | 72.8% | 48 min | 0.0% | 673 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to LAX
On-time arrival % by scheduled departure hour (local time), 2,007 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 93.4% | 1.1% | 92 |
| 6am–7am | 82.7% | 1.0% | 690 |
| 7am–8am | 85.4% | 0.0% | 146 |
| 8am–9am | 87.2% | 0.0% | 218 |
| 9am–10am | 78.9% | 0.0% | 71 |
| 10am–11am | 87.9% | 0.0% | 91 |
| 11am–12pm | 87.9% | 0.0% | 33 |
| 12pm–1pm | Limited data | 13 | |
| 1pm–2pm | Limited data | 14 | |
| 2pm–3pm | 68.3% | 0.0% | 41 |
| 3pm–4pm | 71.9% | 0.0% | 32 |
| 4pm–5pm | 69.8% | 0.0% | 53 |
| 5pm–6pm | Limited data | 23 | |
| 6pm–7pm | 80.6% | 0.0% | 103 |
| 7pm–8pm | 62.6% | 1.0% | 101 |
| 8pm–9pm | 52.6% | 0.0% | 97 |
| 9pm–10pm | 49.6% | 0.0% | 139 |
| 10pm–11pm | 65.3% | 2.0% | 50 |
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 LAX
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) | 69.6% | -10.2 pts | 0.0% | 46 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.4% | -11.3 pts | 0.0% | 95 |
| Summer peak (Jun 15 - Aug 15) | 74.5% | -5.3 pts | 0.3% | 373 |
| All other days | 79.7% | — | 0.6% | 1,493 |
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).