Historical on-time performance
St. Louis to Pittsburgh
553 miData through Dec 2025Source: US DOT · BTS
Flights on STL–PIT arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 327 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time80%Medianon timep9035 minCancel0.3%Flights327
Why flights run late
Delay causes
- Airline28%
- Weather2%
- Air traffic (NAS)5%
- Late aircraft66%
- 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 → PIT
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 — 92% on time.
- Mornings92% on time · p90 10 min · 246 flights
- Middays85% on time · p90 20 min · 287 flights
- Evenings81% on time · p90 25 min · 124 flights · limited
- Afternoons77% on time · p90 35 min · 422 flights
- Overnights58% on time · p90 70 min · 83 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 86% on time.
- Tuesdays86% on time · p90 25 min · 157 flights · limited
- Wednesdays84% on time · p90 25 min · 157 flights · limited
- Saturdays83% on time · p90 20 min · 151 flights · limited
- Mondays83% on time · p90 25 min · 157 flights · limited
- Thursdays81% on time · p90 25 min · 156 flights · limited
- Fridays78% on time · p90 35 min · 156 flights · limited
- Sundays76% on time · p90 40 min · 228 flights
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