OnTimeStats

Historical on-time performance

Salt Lake City to San Antonio

1,087 miData through Dec 2025Source: US DOT · BTS

Flights on SLC–SAT arrive on time 83% of the time over the last 12 months.

On-time rate83%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights

based on 998 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-time83%
    Medianon time
    p9025 min
    Cancel0.8%
    Flights998

Why flights run late

Delay causes

  • Airline63%
  • Weather1%
  • Air traffic (NAS)12%
  • Late aircraft25%
  • 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 SLC → 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 — 86% on time.

  • Mornings86% on time · p90 20 min · 795 flights
  • Middays82% on time · p90 30 min · 1,033 flights
  • Evenings81% on time · p90 35 min · 259 flights
  • Overnights78% on time · p90 35 min · 836 flights
  • Afternoons70% on time · p90 55 min · 135 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 80% to 84% on time.

  • Saturdays84% on time · p90 20 min · 349 flights
  • Wednesdays84% on time · p90 25 min · 449 flights
  • Tuesdays83% on time · p90 30 min · 449 flights
  • Sundays81% on time · p90 30 min · 445 flights
  • Mondays80% on time · p90 30 min · 457 flights
  • Fridays80% on time · p90 30 min · 454 flights
  • Thursdays80% on time · p90 35 min · 455 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.