OnTimeStats

Historical on-time performance

Miami to San Antonio

1,143 miData through Dec 2025Source: US DOT · BTS

Flights on MIA–SAT arrive on time 66% of the time over the last 12 months.

On-time rate66%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled1.8%of scheduled flights

based on 437 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Envoy Airbest
    On-time84%
    Medianon time
    p9020 min
    Cancel1.1%
    Flights92
  • American Airlines
    On-time61%
    Medianon time
    p9070 min
    Cancel2.0%
    Flights345

Why flights run late

Delay causes

  • Airline40%
  • Weather2%
  • Air traffic (NAS)11%
  • Late aircraft45%
  • Security1%

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 → SAT

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 65% to 71% on time.

  • Afternoons71% on time · p90 50 min · 224 flights
  • Middays69% on time · p90 35 min · 185 flights · limited
  • Overnights65% on time · p90 60 min · 1,046 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 60% to 73% on time.

  • Tuesdays73% on time · p90 50 min · 211 flights
  • Fridays71% on time · p90 60 min · 217 flights
  • Wednesdays70% on time · p90 40 min · 211 flights
  • Mondays67% on time · p90 55 min · 220 flights
  • Thursdays63% on time · p90 55 min · 212 flights
  • Sundays62% on time · p90 70 min · 216 flights
  • Saturdays60% on time · p90 65 min · 230 flights
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Related pages

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.