Historical on-time performance
Kansas City to St. Louis
237 miData through May 2026Source: US DOT · BTS
Flights on MCI–STL arrive on time 86% of the time over the last 12 months.
On-time rate86%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 1,020 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time86%Medianon timep9020 minCancel0.5%Flights1,020
Why flights run late
Delay causes
- Airline20%
- Weather4%
- Air traffic (NAS)11%
- Late aircraft65%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline20%
- Weather80%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 5 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly MCI → STL
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 94% on time.
- Mornings94% on time · p90 on time · 1,154 flights
- Middays89% on time · p90 15 min · 842 flights
- Afternoons84% on time · p90 25 min · 390 flights
- Evenings72% on time · p90 40 min · 773 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 91% on time.
- Tuesdays91% on time · p90 10 min · 465 flights
- Wednesdays89% on time · p90 15 min · 462 flights
- Fridays88% on time · p90 15 min · 491 flights
- Saturdays87% on time · p90 20 min · 326 flights
- Mondays83% on time · p90 20 min · 490 flights
- Sundays83% on time · p90 30 min · 463 flights
- Thursdays82% on time · p90 25 min · 487 flights
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