Historical on-time performance
Seattle to San Jose
697 miData through May 2026Source: US DOT · BTS
Flights on SEA–SJC arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 4,376 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesbestOn-time88%Medianon timep9015 minCancel0.2%Flights1,538
- Alaska AirlinesOn-time78%Medianon timep9030 minCancel1.8%Flights1,891
- Southwest AirlinesOn-time73%Medianon timep9040 minCancel0.3%Flights947
Why flights run late
Delay causes
- Airline41%
- Weather8%
- Air traffic (NAS)11%
- Late aircraft39%
- Security1%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline73%
- Weather25%
- Air traffic (NAS)3%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 40 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 → SJC
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 — 89% on time.
- Mornings89% on time · p90 15 min · 3,811 flights
- Afternoons81% on time · p90 30 min · 2,621 flights
- Middays79% on time · p90 30 min · 3,050 flights
- Evenings78% on time · p90 35 min · 2,739 flights
- Overnights71% on time · p90 45 min · 1,254 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 85% on time.
- Tuesdays85% on time · p90 20 min · 1,902 flights
- Wednesdays84% on time · p90 25 min · 1,912 flights
- Saturdays84% on time · p90 25 min · 1,529 flights
- Mondays81% on time · p90 30 min · 2,061 flights
- Thursdays80% on time · p90 30 min · 2,051 flights
- Sundays78% on time · p90 35 min · 1,901 flights
- Fridays77% on time · p90 30 min · 2,119 flights
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