OnTimeStats

Historical on-time performance

St. Louis to Kansas City

237 miData through Dec 2025Source: US DOT · BTS

Flights on STL–MCI arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights

based on 1,021 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
    p9035 min
    Cancel1.1%
    Flights1,021

Why flights run late

Delay causes

  • Airline21%
  • Weather2%
  • Air traffic (NAS)8%
  • Late aircraft69%
  • 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 → MCI

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 63% to 90% on time.

  • Mornings90% on time · p90 10 min · 412 flights
  • Middays89% on time · p90 15 min · 896 flights
  • Afternoons75% on time · p90 35 min · 753 flights
  • Evenings67% on time · p90 55 min · 188 flights · limited
  • Overnights63% on time · p90 55 min · 973 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 67% to 82% on time.

  • Tuesdays82% on time · p90 25 min · 493 flights
  • Wednesdays80% on time · p90 30 min · 491 flights
  • Mondays78% on time · p90 30 min · 493 flights
  • Fridays77% on time · p90 35 min · 493 flights
  • Saturdays75% on time · p90 40 min · 310 flights
  • Thursdays75% on time · p90 35 min · 488 flights
  • Sundays67% on time · p90 50 min · 454 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.