Historical on-time performance
Milwaukee to St. Louis
317 miData through May 2026Source: US DOT · BTS
Flights on MKE–STL arrive on time 88% of the time over the last 12 months.
On-time rate88%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 683 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time88%Medianon timep9015 minCancel0.9%Flights683
Why flights run late
Delay causes
- Airline42%
- Weather0%
- Air traffic (NAS)9%
- Late aircraft49%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline17%
- Weather83%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 6 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 MKE → 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 · 973 flights
- Afternoons85% on time · p90 25 min · 396 flights
- Middays83% on time · p90 25 min · 128 flights · limited
- Evenings74% on time · p90 45 min · 542 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 91% on time.
- Saturdays91% on time · p90 5 min · 204 flights
- Wednesdays89% on time · p90 20 min · 323 flights
- Tuesdays86% on time · p90 20 min · 324 flights
- Mondays86% on time · p90 20 min · 321 flights
- Fridays85% on time · p90 25 min · 323 flights
- Sundays84% on time · p90 30 min · 258 flights
- Thursdays83% on time · p90 30 min · 321 flights
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