Historical on-time performance
Seattle to San Francisco
Flights on SEA–SFO arrive on time 68% of the time over the last 12 months.
based on 6,757 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesbestOn-time78%Medianon timep9035 minCancel1.0%Flights1,108
- United AirlinesOn-time71%Medianon timep9065 minCancel0.7%Flights2,012
- Delta Air LinesOn-time68%Medianon timep9055 minCancel1.8%Flights893
- Alaska AirlinesOn-time61%Median5 minp9060 minCancel1.4%Flights2,744
Why flights run late
Delay causes
- Airline26%
- Weather4%
- Air traffic (NAS)48%
- Late aircraft22%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline64%
- Weather19%
- Air traffic (NAS)18%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 80 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 → SFO
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 66% to 73% on time.
- Afternoons73% on time · p90 50 min · 2,395 flights
- Middays72% on time · p90 45 min · 4,742 flights
- Mornings71% on time · p90 50 min · 6,407 flights
- Overnights66% on time · p90 55 min · 2,110 flights
- Evenings66% on time · p90 65 min · 4,427 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 77% on time.
- Tuesdays77% on time · p90 35 min · 2,791 flights
- Saturdays77% on time · p90 35 min · 2,489 flights
- Wednesdays72% on time · p90 50 min · 2,810 flights
- Thursdays67% on time · p90 55 min · 3,014 flights
- Mondays67% on time · p90 55 min · 3,048 flights
- Fridays66% on time · p90 60 min · 3,031 flights
- Sundays66% on time · p90 60 min · 2,898 flights
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