OnTimeStats

Historical on-time performance

Detroit to San Antonio

1,214 miData through Dec 2025Source: US DOT · BTS

Flights on DTW–SAT arrive on time 80% of the time over the last 12 months.

On-time rate80%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights

based on 932 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Delta Air Lines
    On-time80%
    Medianon time
    p9040 min
    Cancel0.4%
    Flights932

Why flights run late

Delay causes

  • Airline55%
  • Weather3%
  • Air traffic (NAS)23%
  • Late aircraft19%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly DTW → 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 74% to 85% on time.

  • Evenings85% on time · p90 20 min · 93 flights · limited
  • Mornings85% on time · p90 25 min · 1,043 flights
  • Middays82% on time · p90 40 min · 631 flights
  • Afternoons81% on time · p90 30 min · 151 flights · limited
  • Overnights74% on time · p90 50 min · 857 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 77% to 85% on time.

  • Tuesdays85% on time · p90 30 min · 400 flights
  • Wednesdays83% on time · p90 30 min · 399 flights
  • Thursdays81% on time · p90 30 min · 406 flights
  • Saturdays80% on time · p90 35 min · 322 flights
  • Mondays80% on time · p90 40 min · 426 flights
  • Fridays79% on time · p90 40 min · 417 flights
  • Sundays77% on time · p90 45 min · 405 flights
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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.