Historical on-time performance
San Jose to Seattle
696 miData through May 2026Source: US DOT · BTS
Flights on SJC–SEA arrive on time 83% of the time over the last 12 months.
On-time rate83%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-time89%Medianon timep9015 minCancel0.2%Flights1,539
- Alaska AirlinesOn-time81%Medianon timep9030 minCancel1.9%Flights1,889
- Southwest AirlinesOn-time76%Medianon timep9040 minCancel0.0%Flights948
Why flights run late
Delay causes
- Airline37%
- Weather7%
- Air traffic (NAS)22%
- Late aircraft33%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline74%
- Weather23%
- Air traffic (NAS)3%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 39 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 SJC → SEA
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 · 3,486 flights
- Middays86% on time · p90 15 min · 3,286 flights
- Afternoons83% on time · p90 25 min · 2,622 flights
- Evenings79% on time · p90 35 min · 3,028 flights
- Overnights70% on time · p90 45 min · 1,065 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 80% to 88% on time.
- Tuesdays88% on time · p90 15 min · 1,903 flights
- Wednesdays86% on time · p90 20 min · 1,927 flights
- Saturdays85% on time · p90 20 min · 1,536 flights
- Mondays84% on time · p90 25 min · 2,060 flights
- Sundays81% on time · p90 30 min · 1,969 flights
- Fridays81% on time · p90 30 min · 2,031 flights
- Thursdays80% on time · p90 30 min · 2,061 flights
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