Historical on-time performance
St. Louis to Los Angeles
1,593 miData through Dec 2025Source: US DOT · BTS
Flights on STL–LAX arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 815 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- American AirlinesOn-time80%Medianon timep9040 minCancel0.0%Flights61
- Southwest AirlinesOn-time76%Medianon timep9040 minCancel0.6%Flights632
- SkyWest AirlinesOn-time74%Medianon timep9035 minCancel0.0%Flights122
Why flights run late
Delay causes
- Airline55%
- Weather4%
- Air traffic (NAS)8%
- Late aircraft33%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly STL → LAX
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 20 min · 1,328 flights
- Middays80% on time · p90 25 min · 345 flights
- Afternoons72% on time · p90 40 min · 352 flights
- Evenings68% on time · p90 70 min · 709 flights
- Overnights57% on time · p90 60 min · 568 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 78% on time.
- Thursdays78% on time · p90 40 min · 484 flights
- Tuesdays77% on time · p90 35 min · 488 flights
- Fridays77% on time · p90 35 min · 501 flights
- Saturdays76% on time · p90 30 min · 391 flights
- Wednesdays74% on time · p90 45 min · 479 flights
- Mondays72% on time · p90 40 min · 504 flights
- Sundays69% on time · p90 50 min · 455 flights
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