Historical on-time performance
Miami to Seattle
Flights on MIA–SEA arrive on time 63% of the time over the last 12 months.
based on 1,066 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.
- American AirlinesOn-time67%Medianon timep9060 minCancel0.5%Flights365
- Alaska AirlinesOn-time62%Medianon timep9055 minCancel1.6%Flights364
- Delta Air LinesOn-time60%Median5 minp9065 minCancel1.8%Flights337
Why flights run late
Delay causes
- Airline45%
- Weather4%
- Air traffic (NAS)20%
- Late aircraft29%
- Security2%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline71%
- Weather21%
- Air traffic (NAS)7%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 14 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 MIA → 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 — 78% on time.
- Mornings78% on time · p90 30 min · 118 flights · limited
- Evenings67% on time · p90 60 min · 2,225 flights
- Overnights58% on time · p90 80 min · 494 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 62% to 73% on time.
- Tuesdays73% on time · p90 45 min · 400 flights
- Wednesdays67% on time · p90 45 min · 399 flights
- Saturdays65% on time · p90 75 min · 411 flights
- Mondays65% on time · p90 60 min · 404 flights
- Thursdays64% on time · p90 65 min · 408 flights
- Fridays64% on time · p90 70 min · 408 flights
- Sundays62% on time · p90 80 min · 411 flights
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