Historical on-time performance
Seattle to Miami
Flights on SEA–MIA arrive on time 75% of the time over the last 12 months.
based on 1,065 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.
- Delta Air LinesOn-time77%Medianon timep9035 minCancel1.5%Flights337
- Alaska AirlinesOn-time75%Medianon timep9030 minCancel0.8%Flights363
- American AirlinesOn-time74%Medianon timep9040 minCancel0.8%Flights365
Why flights run late
Delay causes
- Airline39%
- Weather2%
- Air traffic (NAS)37%
- Late aircraft22%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline55%
- Weather36%
- Air traffic (NAS)9%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 11 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 → MIA
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 76% to 77% on time.
- Overnights77% on time · p90 45 min · 1,141 flights
- Mornings76% on time · p90 30 min · 1,625 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 82% on time.
- Tuesdays82% on time · p90 30 min · 395 flights
- Thursdays77% on time · p90 35 min · 412 flights
- Wednesdays77% on time · p90 30 min · 400 flights
- Sundays77% on time · p90 35 min · 414 flights
- Mondays76% on time · p90 40 min · 401 flights
- Saturdays74% on time · p90 45 min · 407 flights
- Fridays71% on time · p90 35 min · 410 flights
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