Historical on-time performance
Seattle to Los Angeles
954 miData through May 2026Source: US DOT · BTS
Flights on SEA–LAX arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 7,183 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time90%Medianon timep9015 minCancel0.3%Flights367
- Frontier AirlinesOn-time85%Medianon timep9015 minCancel1.6%Flights61
- SkyWest AirlinesOn-time85%Medianon timep9025 minCancel0.6%Flights1,248
- Delta Air LinesOn-time84%Medianon timep9025 minCancel0.6%Flights2,222
- Alaska AirlinesOn-time79%Medianon timep9030 minCancel1.1%Flights3,285
Why flights run late
Delay causes
- Airline53%
- Weather3%
- Air traffic (NAS)13%
- Late aircraft31%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline68%
- Weather25%
- Air traffic (NAS)7%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 60 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SEA → LAX
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 15 min · 7,023 flights
- Middays82% on time · p90 25 min · 5,121 flights
- Afternoons82% on time · p90 25 min · 3,205 flights
- Evenings78% on time · p90 35 min · 5,398 flights
- Overnights72% on time · p90 45 min · 1,784 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 85% on time.
- Tuesdays85% on time · p90 20 min · 3,002 flights
- Wednesdays85% on time · p90 20 min · 2,966 flights
- Saturdays84% on time · p90 20 min · 2,883 flights
- Mondays82% on time · p90 25 min · 3,455 flights
- Thursdays80% on time · p90 25 min · 3,462 flights
- Fridays80% on time · p90 30 min · 3,425 flights
- Sundays78% on time · p90 40 min · 3,338 flights
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