OnTimeStats

Historical on-time performance

Denver to Pittsburgh

1,290 miData through Dec 2025Source: US DOT · BTS

Flights on DEN–PIT arrive on time 69% of the time over the last 12 months.

On-time rate69%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights

based on 1,702 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time77%
    Medianon time
    p9040 min
    Cancel0.2%
    Flights905
  • Southwest Airlines
    On-time61%
    Median5 min
    p9070 min
    Cancel0.6%
    Flights797

Why flights run late

Delay causes

  • Airline29%
  • Weather2%
  • Air traffic (NAS)14%
  • Late aircraft55%
  • 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 DEN → PIT

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 · 783 flights
  • Middays79% on time · p90 35 min · 1,782 flights
  • Afternoons66% on time · p90 60 min · 438 flights
  • Evenings64% on time · p90 70 min · 1,842 flights
  • Overnights57% on time · p90 75 min · 294 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 69% to 75% on time.

  • Sundays75% on time · p90 50 min · 750 flights
  • Saturdays73% on time · p90 50 min · 596 flights
  • Mondays73% on time · p90 50 min · 767 flights
  • Tuesdays72% on time · p90 50 min · 748 flights
  • Wednesdays72% on time · p90 45 min · 706 flights
  • Thursdays70% on time · p90 55 min · 806 flights
  • Fridays69% on time · p90 55 min · 766 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.