Historical on-time performance
Boston to Seattle
Flights on BOS–SEA arrive on time 69% of the time over the last 12 months.
based on 2,395 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- JetBlue AirwaysOn-time73%Medianon timep9065 minCancel0.5%Flights205
- Delta Air LinesOn-time70%Medianon timep9035 minCancel1.5%Flights979
- Alaska AirlinesOn-time67%Medianon timep9045 minCancel1.1%Flights1,211
Why flights run late
Delay causes
- Airline24%
- Weather2%
- Air traffic (NAS)36%
- Late aircraft36%
- Security1%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline55%
- Weather41%
- Air traffic (NAS)3%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 29 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 BOS → SEA
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 70% to 81% on time.
- Middays81% on time · p90 25 min · 956 flights
- Mornings79% on time · p90 30 min · 3,194 flights
- Afternoons74% on time · p90 60 min · 659 flights
- Evenings70% on time · p90 60 min · 2,739 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 78% on time.
- Wednesdays78% on time · p90 35 min · 1,047 flights
- Mondays78% on time · p90 35 min · 1,121 flights
- Tuesdays77% on time · p90 35 min · 1,044 flights
- Saturdays76% on time · p90 40 min · 998 flights
- Sundays73% on time · p90 40 min · 1,103 flights
- Thursdays73% on time · p90 40 min · 1,112 flights
- Fridays72% on time · p90 50 min · 1,123 flights
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