OnTimeStats

Historical on-time performance

Miami to San Antonio

1,143 miData through May 2026Source: US DOT · BTS

Flights on MIA–SAT arrive on time 62% of the time over the last 12 months.

On-time rate62%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights

based on 399 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • American Airlines
    On-time62%
    Medianon time
    p9060 min
    Cancel1.5%
    Flights399

Why flights run late

Delay causes

  • Airline38%
  • Weather2%
  • Air traffic (NAS)12%
  • Late aircraft47%
  • Security1%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline0%
  • Weather100%
  • Air traffic (NAS)0%
  • Security0%

Most cancellations here are attributed to Weather. Shares are among 6 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 → SAT

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 64% to 71% on time.

  • Afternoons71% on time · p90 50 min · 276 flights
  • Middays68% on time · p90 35 min · 186 flights · limited
  • Overnights64% 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 59% to 75% on time.

  • Tuesdays75% on time · p90 45 min · 217 flights
  • Wednesdays70% on time · p90 35 min · 218 flights
  • Fridays68% on time · p90 55 min · 227 flights
  • Mondays66% on time · p90 55 min · 227 flights
  • Thursdays65% on time · p90 55 min · 222 flights
  • Sundays60% on time · p90 70 min · 225 flights
  • Saturdays59% on time · p90 70 min · 234 flights

Keep exploring

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.