75% of flights from Los Angeles to St. Louis arrived on time over the past 12 months. That is worse than the typical U.S. route. The 5 a.m. departures ran on time 93% of the time; the 1 p.m. ones 58%. Most reliable airline: American Airlines (76%). 7% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for LAX → STL: when a flight was late, it was under 45 minutes late 63% of the time. About 1 in 16 flights landed an hour or more late, and 1 in 206 three hours or more; 0.5% were cancelled outright.
- On time or early75%
- 15–30 min late12%
- 30–60 min late6.5%
- 1–2 hours late4.1%
- 2–3 hours late1.7%
- 3+ hours late0.5%
- Diverted0.3%
- Cancelled0.5%
Share of all 1,028 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Southwest Airlines | 674 | 74% | 0.3% | 0 min | 5.3% | +48 min | Southwest Airlines |
| American Airlines | 354 | 76% | 0.9% | −2 min | 7.9% | +60 min | SkyWest |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at LAX). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Southwest Airlines | American Airlines |
|---|---|---|
| 5 a.m. | 93% | — |
| 1 p.m. | 58% | — |
| 6 p.m. | — | 76% |
Last flight of the day
On LAX → STL, each airline's last flight of the day was cancelled 0.0% of the time, against 0.7% for its earlier flights, so here the last flight is actually the safer one. It arrived 3+ hours late 0.4% of the time (earlier flights: 0.7%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| Southwest Airlines | 1:30 p.m. | 0.0% | 0.4% | 0.7% | first flight 6:35 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
By month
Each calendar month pooled over 2023–2026. Best: October (85%). Worst: June (72%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 162 | 73% | 1.8% |
| Tuesday | 134 | 75% | 0.0% |
| Wednesday | 129 | 84% | 0.8% |
| Thursday | 155 | 74% | 0.0% |
| Friday | 160 | 74% | 0.0% |
| Saturday | 133 | 73% | 0.8% |
| Sunday | 155 | 73% | 0.0% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 4 · air traffic/airport 1
Month by month
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Jun 18, 2026 | 3 | 0% | 0 |
| Aug 28, 2026 | 3 | 0% | 0 |
| May 21, 2026 | 3 | 0% | 0 |
| Nov 30, 2025 | 4 | 25% | 0 |
| Nov 9, 2025 | 4 | 25% | 0 |
Questions
How often are flights from LAX to STL on time?
75% of 1,028 scheduled flights from Los Angeles, CA to St. Louis, MO arrived within 15 minutes of schedule between September 2025 and August 2026. 0.5% were cancelled.
What is the best time of day to fly LAX to STL?
Flights scheduled to leave at 5 a.m. were the most reliable (93% on time). The 1 p.m. departures were the least (58%).
Which airline is most on time from LAX to STL?
American Airlines: 76% of its 354 flights on the route arrived on time. Southwest Airlines: 74%.
What month has the most delays from LAX to STL?
June (72% on time). The best month is October (85%), over 2023–2026.
Is the last flight of the day from LAX to STL more likely to be cancelled?
No, the opposite. Each airline's last LAX–STL flight of the day was cancelled 0.0% of the time over the past year, against 0.7% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- STL → LAX (return)
- Los Angeles LAX (LAX) delays by hour
- Flights into St. Louis Lambert (STL)
- Southwest Airlines on-time record
- American Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.