OnTimeStats

Historical on-time performance

Pittsburgh to Denver

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

Flights on PIT–DEN arrive on time 80% of the time over the last 12 months.

On-time rate80%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights

based on 1,705 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time84%
    Medianon time
    p9025 min
    Cancel0.2%
    Flights905
  • Southwest Airlines
    On-time76%
    Medianon time
    p9050 min
    Cancel0.3%
    Flights800

Why flights run late

Delay causes

  • Airline16%
  • Weather5%
  • Air traffic (NAS)51%
  • Late aircraft28%
  • Security0%

Most delay minutes here are attributed to Air traffic (NAS).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly PIT → DEN

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 64% to 89% on time.

  • Mornings89% on time · p90 15 min · 1,985 flights
  • Middays88% on time · p90 15 min · 832 flights
  • Afternoons77% on time · p90 45 min · 1,245 flights
  • Evenings66% on time · p90 65 min · 848 flights
  • Overnights64% on time · p90 60 min · 223 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 78% to 83% on time.

  • Wednesdays83% on time · p90 30 min · 706 flights
  • Mondays83% on time · p90 25 min · 766 flights
  • Tuesdays83% on time · p90 35 min · 749 flights
  • Sundays83% on time · p90 30 min · 740 flights
  • Fridays78% on time · p90 40 min · 761 flights
  • Saturdays78% on time · p90 40 min · 609 flights
  • Thursdays78% on time · p90 35 min · 802 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.