OnTimeStats

Historical on-time performance

Las Vegas to St. Louis

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

Flights on LAS–STL arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 1,759 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time78%
    Medianon time
    p9040 min
    Cancel0.6%
    Flights1,759

Why flights run late

Delay causes

  • Airline38%
  • Weather1%
  • Air traffic (NAS)10%
  • 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 → STL

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 — 91% on time.

  • Mornings91% on time · p90 10 min · 2,495 flights
  • Middays72% on time · p90 40 min · 987 flights
  • Evenings65% on time · p90 65 min · 1,225 flights
  • Afternoons65% on time · p90 55 min · 1,177 flights
  • Overnights59% on time · p90 65 min · 274 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 72% to 84% on time.

  • Saturdays84% on time · p90 25 min · 666 flights
  • Wednesdays83% on time · p90 30 min · 831 flights
  • Tuesdays83% on time · p90 25 min · 831 flights
  • Mondays74% on time · p90 40 min · 959 flights
  • Fridays73% on time · p90 50 min · 960 flights
  • Sundays72% on time · p90 45 min · 988 flights
  • Thursdays72% on time · p90 50 min · 923 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.