OnTimeStats

Historical on-time performance

Miami to Boston

1,258 miData through Dec 2025Source: US DOT · BTS

Flights on MIA–BOS arrive on time 69% of the time over the last 12 months.

On-time rate69%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights

based on 3,569 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.

  • Spirit Airlines
    On-time77%
    Medianon time
    p9045 min
    Cancel1.2%
    Flights162
  • American Airlines
    On-time71%
    Medianon time
    p9060 min
    Cancel1.1%
    Flights2,218
  • Delta Air Lines
    On-time63%
    Medianon time
    p9090 min
    Cancel1.8%
    Flights773
  • JetBlue Airways
    On-time67%
    Medianon time
    p9075 min
    Cancel2.9%
    Flights416

Why flights run late

Delay causes

  • Airline36%
  • Weather5%
  • Air traffic (NAS)23%
  • Late aircraft37%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

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 (2023-01 .. 2025-12).

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 · 1,804 flights
  • Middays72% on time · p90 55 min · 3,572 flights
  • Afternoons64% on time · p90 90 min · 1,360 flights
  • Overnights63% on time · p90 85 min · 1,905 flights
  • Evenings60% on time · p90 85 min · 2,626 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 63% to 73% on time.

  • Tuesdays73% on time · p90 60 min · 1,588 flights
  • Wednesdays72% on time · p90 60 min · 1,545 flights
  • Saturdays71% on time · p90 60 min · 1,606 flights
  • Mondays70% on time · p90 65 min · 1,622 flights
  • Fridays69% on time · p90 70 min · 1,612 flights
  • Thursdays68% on time · p90 75 min · 1,619 flights
  • Sundays63% on time · p90 90 min · 1,675 flights
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Keep exploring

Related pages

Delay predictorfor this route→MIA airportMiami→BOS airportBoston→Republic Airways on this routecarrier detail→Republic Airwaysairline profile→

Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.