Historical on-time performance
Seattle to San Diego
1,050 miData through May 2026Source: US DOT · BTS
Flights on SEA–SAN arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 4,547 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time82%Medianon timep9030 minCancel0.9%Flights1,698
- Alaska AirlinesOn-time74%Medianon timep9035 minCancel1.5%Flights2,788
- Southwest AirlinesOn-time59%Median10 minp9035 minCancel0.0%Flights61
Why flights run late
Delay causes
- Airline39%
- Weather3%
- Air traffic (NAS)29%
- Late aircraft29%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline70%
- Weather27%
- Air traffic (NAS)4%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 56 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 → SAN
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 — 84% on time.
- Mornings84% on time · p90 25 min · 4,508 flights
- Middays79% on time · p90 30 min · 2,832 flights
- Afternoons77% on time · p90 35 min · 2,686 flights
- Overnights74% on time · p90 40 min · 912 flights
- Evenings71% on time · p90 35 min · 2,890 flights
Best day of week
Tuesdays are the most reliable day to fly this route — 84% on time.
- Tuesdays84% on time · p90 20 min · 1,907 flights
- Wednesdays81% on time · p90 30 min · 1,882 flights
- Saturdays80% on time · p90 30 min · 1,694 flights
- Mondays78% on time · p90 30 min · 2,101 flights
- Thursdays76% on time · p90 35 min · 2,112 flights
- Sundays75% on time · p90 35 min · 2,045 flights
- Fridays75% on time · p90 35 min · 2,087 flights
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