OnTimeStats

Historical on-time performance

St. Louis to Las Vegas

1,372 miData through Dec 2025Source: US DOT · BTS

Flights on STL–LAS arrive on time 79% of the time over the last 12 months.

On-time rate79%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights

based on 1,760 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time79%
    Medianon time
    p9035 min
    Cancel0.9%
    Flights1,760

Why flights run late

Delay causes

  • Airline27%
  • Weather4%
  • Air traffic (NAS)20%
  • Late aircraft50%
  • 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 STL → LAS

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 — 90% on time.

  • Mornings90% on time · p90 10 min · 2,002 flights
  • Middays78% on time · p90 35 min · 908 flights
  • Afternoons71% on time · p90 45 min · 1,079 flights
  • Evenings67% on time · p90 60 min · 1,063 flights
  • Overnights65% on time · p90 55 min · 1,104 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 73% to 81% on time.

  • Tuesdays81% on time · p90 30 min · 826 flights
  • Wednesdays79% on time · p90 30 min · 816 flights
  • Saturdays77% on time · p90 40 min · 673 flights
  • Mondays77% on time · p90 40 min · 967 flights
  • Thursdays75% on time · p90 40 min · 928 flights
  • Fridays74% on time · p90 40 min · 964 flights
  • Sundays73% on time · p90 45 min · 982 flights
Advertisement

Keep exploring

Related pages

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.