OnTimeStats

Historical on-time performance

Las Vegas to Des Moines

1,216 miData through Dec 2025Source: US DOT · BTS

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

On-time rate77%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 337 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time77%
    Medianon time
    p9025 min
    Cancel0.6%
    Flights337

Why flights run late

Delay causes

  • Airline34%
  • Weather0%
  • Air traffic (NAS)15%
  • Late aircraft51%
  • 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 LAS → 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 — 85% on time.

  • Mornings85% on time · p90 20 min · 222 flights
  • Middays78% on time · p90 30 min · 901 flights
  • Afternoons67% on time · p90 70 min · 186 flights · limited
  • Evenings58% on time · p90 90 min · 272 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 69% to 85% on time.

  • Tuesdays85% on time · p90 20 min · 128 flights · limited
  • Wednesdays82% on time · p90 25 min · 155 flights · limited
  • Saturdays77% on time · p90 40 min · 154 flights · limited
  • Mondays75% on time · p90 35 min · 274 flights
  • Thursdays72% on time · p90 45 min · 279 flights
  • Fridays69% on time · p90 60 min · 275 flights
  • Sundays69% on time · p90 45 min · 316 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.