OnTimeStats

Historical on-time performance

Boston to Miami

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

Flights on BOS–MIA arrive on time 76% of the time over the last 12 months.

On-time rate76%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights

based on 3,542 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 Airlines
    On-time80%
    Medianon time
    p9035 min
    Cancel1.1%
    Flights2,218
  • Delta Air Lines
    On-time70%
    Medianon time
    p9075 min
    Cancel1.5%
    Flights775
  • Spirit Airlines
    On-time73%
    Medianon time
    p9055 min
    Cancel0.8%
    Flights132
  • JetBlue Airways
    On-time65%
    Medianon time
    p9080 min
    Cancel1.7%
    Flights417

Why flights run late

Delay causes

  • Airline31%
  • Weather1%
  • Air traffic (NAS)32%
  • Late aircraft35%
  • 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 BOS → MIA

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 · 5,506 flights
  • Middays74% on time · p90 55 min · 2,097 flights
  • Evenings68% on time · p90 60 min · 1,441 flights
  • Afternoons60% on time · p90 90 min · 2,120 flights
  • Overnights51% on time · p90 120 min · 99 flights · limited

Best day of week

Tuesdays are the most reliable day to fly this route — 81% on time.

  • Tuesdays81% on time · p90 35 min · 1,578 flights
  • Wednesdays78% on time · p90 40 min · 1,542 flights
  • Saturdays75% on time · p90 50 min · 1,599 flights
  • Fridays75% on time · p90 45 min · 1,611 flights
  • Thursdays75% on time · p90 45 min · 1,631 flights
  • Mondays75% on time · p90 55 min · 1,622 flights
  • Sundays72% on time · p90 55 min · 1,680 flights
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Keep exploring

Related pages

Delay predictorfor this route→BOS airportBoston→MIA airportMiami→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.