OnTimeStats

Historical on-time performance

Dallas to Denver

651 miData through Dec 2025Source: US DOT · BTS

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

On-time rate69%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled1.6%of scheduled flights

based on 3,042 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time69%
    Medianon time
    p9060 min
    Cancel1.6%
    Flights3,042

Why flights run late

Delay causes

  • Airline25%
  • Weather7%
  • Air traffic (NAS)29%
  • Late aircraft39%
  • 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 DAL → DEN

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 — 87% on time.

  • Mornings87% on time · p90 15 min · 2,869 flights
  • Middays77% on time · p90 35 min · 2,297 flights
  • Afternoons66% on time · p90 60 min · 1,579 flights
  • Evenings61% on time · p90 75 min · 1,845 flights
  • Overnights60% on time · p90 75 min · 1,177 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 68% to 77% on time.

  • Tuesdays77% on time · p90 40 min · 1,405 flights
  • Saturdays76% on time · p90 40 min · 1,101 flights
  • Mondays75% on time · p90 45 min · 1,479 flights
  • Wednesdays72% on time · p90 45 min · 1,404 flights
  • Sundays71% on time · p90 50 min · 1,462 flights
  • Fridays71% on time · p90 45 min · 1,467 flights
  • Thursdays68% on time · p90 60 min · 1,449 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.