Historical on-time performance
Miami to Boston
Flights on MIA–BOS arrive on time 68% of the time over the last 12 months.
based on 3,359 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-time69%Medianon timep9065 minCancel1.9%Flights2,212
- Delta Air LinesOn-time67%Medianon timep9075 minCancel2.9%Flights886
- JetBlue AirwaysOn-time66%Medianon timep9080 minCancel3.8%Flights132
- Spirit AirlinesOn-time44%Median15 minp90100 minCancel7.0%Flights129
Why flights run late
Delay causes
- Airline32%
- Weather3%
- Air traffic (NAS)22%
- Late aircraft42%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline17%
- Weather76%
- Air traffic (NAS)7%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 82 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 → BOS
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 — 87% on time.
- Mornings87% on time · p90 15 min · 1,952 flights
- Middays71% on time · p90 60 min · 3,326 flights
- Afternoons64% on time · p90 85 min · 1,358 flights
- Overnights62% on time · p90 85 min · 1,984 flights
- Evenings59% on time · p90 85 min · 2,602 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 61% to 73% on time.
- Wednesdays73% on time · p90 55 min · 1,531 flights
- Tuesdays72% on time · p90 60 min · 1,561 flights
- Saturdays71% on time · p90 60 min · 1,622 flights
- Mondays69% on time · p90 70 min · 1,613 flights
- Fridays68% on time · p90 70 min · 1,623 flights
- Thursdays68% on time · p90 75 min · 1,615 flights
- Sundays61% on time · p90 85 min · 1,657 flights
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