OnTimeStats

Historical on-time performance

Las Vegas to San Antonio

1,069 miData through Dec 2025Source: US DOT · BTS

Flights on LAS–SAT arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights

based on 1,980 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Spirit Airlinesbest
    On-time86%
    Medianon time
    p9035 min
    Cancel0.7%
    Flights451
  • Southwest Airlines
    On-time75%
    Medianon time
    p9045 min
    Cancel0.7%
    Flights1,529

Why flights run late

Delay causes

  • Airline32%
  • Weather2%
  • Air traffic (NAS)16%
  • Late aircraft51%
  • 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 LAS → SAT

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 — 90% on time.

  • Mornings90% on time · p90 10 min · 2,289 flights
  • Early mornings79% on time · p90 35 min · 155 flights · limited
  • Middays78% on time · p90 30 min · 1,314 flights
  • Evenings66% on time · p90 65 min · 1,088 flights
  • Afternoons64% on time · p90 65 min · 1,258 flights
  • Overnights62% on time · p90 60 min · 565 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 71% to 83% on time.

  • Wednesdays83% on time · p90 25 min · 868 flights
  • Saturdays81% on time · p90 30 min · 827 flights
  • Tuesdays81% on time · p90 30 min · 847 flights
  • Mondays75% on time · p90 40 min · 1,044 flights
  • Sundays74% on time · p90 40 min · 1,063 flights
  • Thursdays73% on time · p90 45 min · 979 flights
  • Fridays71% on time · p90 55 min · 1,041 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.