OnTimeStats

Historical on-time performance

Denver to Des Moines

589 miData through Dec 2025Source: US DOT · BTS

Flights on DEN–DSM arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights

based on 2,072 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlinesbest
    On-time86%
    Medianon time
    p9025 min
    Cancel0.9%
    Flights848
  • United Airlines
    On-time77%
    Medianon time
    p9060 min
    Cancel0.7%
    Flights767
  • Southwest Airlines
    On-time62%
    Median5 min
    p9090 min
    Cancel0.4%
    Flights457

Why flights run late

Delay causes

  • Airline30%
  • Weather3%
  • Air traffic (NAS)12%
  • Late aircraft56%
  • 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 → DSM

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 · 1,202 flights
  • Middays82% on time · p90 30 min · 2,128 flights
  • Afternoons72% on time · p90 40 min · 396 flights
  • Overnights69% on time · p90 60 min · 1,547 flights
  • Evenings63% on time · p90 85 min · 1,599 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 72% to 77% on time.

  • Wednesdays77% on time · p90 50 min · 981 flights
  • Saturdays76% on time · p90 55 min · 903 flights
  • Mondays76% on time · p90 50 min · 1,017 flights
  • Sundays75% on time · p90 50 min · 987 flights
  • Tuesdays75% on time · p90 45 min · 969 flights
  • Thursdays73% on time · p90 50 min · 999 flights
  • Fridays72% on time · p90 60 min · 1,016 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.