Historical on-time performance
Boston to Miami
1,258 miData through May 2026Source: US DOT · BTS
Flights on BOS–MIA arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled2.3%of scheduled flights
based on 3,362 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesbestOn-time79%Medianon timep9040 minCancel1.9%Flights2,213
- Delta Air LinesOn-time70%Medianon timep9065 minCancel2.8%Flights888
- JetBlue AirwaysOn-time67%Medianon timep9075 minCancel2.3%Flights132
- Spirit AirlinesOn-time51%Median5 minp90115 minCancel6.2%Flights129
Why flights run late
Delay causes
- Airline35%
- Weather2%
- Air traffic (NAS)28%
- Late aircraft34%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline18%
- Weather74%
- Air traffic (NAS)8%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 78 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 → MIA
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 — 86% on time.
- Mornings86% on time · p90 20 min · 5,409 flights
- Middays74% on time · p90 55 min · 2,155 flights
- Evenings66% on time · p90 65 min · 1,568 flights
- Afternoons60% on time · p90 90 min · 1,964 flights
- Overnights54% on time · p90 100 min · 125 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 80% on time.
- Tuesdays80% on time · p90 40 min · 1,553 flights
- Wednesdays79% on time · p90 35 min · 1,528 flights
- Fridays76% on time · p90 50 min · 1,624 flights
- Thursdays76% on time · p90 45 min · 1,624 flights
- Mondays75% on time · p90 55 min · 1,615 flights
- Saturdays75% on time · p90 50 min · 1,616 flights
- Sundays71% on time · p90 60 min · 1,661 flights
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