Historical on-time performance
Pittsburgh to St. Louis
554 miData through May 2026Source: US DOT · BTS
Flights on PIT–STL arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights
based on 401 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time83%Medianon timep9025 minCancel0.0%Flights401
Why flights run late
Delay causes
- Airline11%
- Weather1%
- Air traffic (NAS)11%
- Late aircraft77%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline86%
- Weather14%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 7 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 PIT → 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 — 95% on time.
- Mornings95% on time · p90 5 min · 313 flights
- Middays89% on time · p90 15 min · 402 flights
- Afternoons86% on time · p90 20 min · 197 flights · limited
- Evenings69% on time · p90 55 min · 155 flights · limited
- Overnights57% on time · p90 80 min · 130 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 90% on time.
- Tuesdays90% on time · p90 10 min · 168 flights · limited
- Wednesdays89% on time · p90 15 min · 168 flights · limited
- Saturdays88% on time · p90 15 min · 134 flights · limited
- Thursdays85% on time · p90 20 min · 170 flights · limited
- Fridays85% on time · p90 30 min · 170 flights · limited
- Mondays83% on time · p90 25 min · 168 flights · limited
- Sundays71% on time · p90 60 min · 219 flights
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