OnTimeStats

Historical on-time performance

St. Louis to San Diego

1,558 miData through Dec 2025Source: US DOT · BTS

Flights on STL–SAN arrive on time 72% of the time over the last 12 months.

On-time rate72%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights

based on 515 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time72%
    Medianon time
    p9050 min
    Cancel0.4%
    Flights515

Why flights run late

Delay causes

  • Airline25%
  • Weather7%
  • Air traffic (NAS)14%
  • Late aircraft54%
  • 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 STL → SAN

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 15 min · 391 flights
  • Middays77% on time · p90 30 min · 413 flights
  • Afternoons71% on time · p90 40 min · 412 flights
  • Overnights54% on time · p90 70 min · 65 flights · limited
  • Evenings54% on time · p90 90 min · 262 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 70% to 80% on time.

  • Tuesdays80% on time · p90 30 min · 204 flights
  • Thursdays75% on time · p90 35 min · 222 flights
  • Saturdays75% on time · p90 40 min · 221 flights
  • Wednesdays74% on time · p90 40 min · 200 flights
  • Sundays73% on time · p90 45 min · 247 flights
  • Mondays70% on time · p90 60 min · 222 flights
  • Fridays70% on time · p90 50 min · 227 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.