OnTimeStats

Historical on-time performance

Pittsburgh to St. Louis

554 miData through Dec 2025Source: US DOT · BTS

Flights on PIT–STL arrive on time 84% of the time over the last 12 months.

On-time rate84%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights

based on 327 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time84%
    Medianon time
    p9025 min
    Cancel0.0%
    Flights327

Why flights run late

Delay causes

  • Airline18%
  • Weather2%
  • Air traffic (NAS)14%
  • Late aircraft65%
  • 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 PIT → STL

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 65% to 93% on time.

  • Mornings93% on time · p90 10 min · 283 flights
  • Middays89% on time · p90 15 min · 452 flights
  • Afternoons86% on time · p90 15 min · 197 flights · limited
  • Evenings66% on time · p90 55 min · 111 flights · limited
  • Overnights65% on time · p90 65 min · 106 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 72% to 90% on time.

  • Wednesdays90% on time · p90 10 min · 157 flights · limited
  • Saturdays89% on time · p90 15 min · 138 flights · limited
  • Thursdays89% on time · p90 15 min · 156 flights · limited
  • Tuesdays89% on time · p90 15 min · 157 flights · limited
  • Fridays87% on time · p90 20 min · 156 flights · limited
  • Mondays85% on time · p90 20 min · 157 flights · limited
  • Sundays72% on time · p90 55 min · 228 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.