Pittsburgh (PIT) to St. Louis (STL): On-Time Performance
Data through May 2026
Pittsburgh (PIT) to St. Louis (STL) effectively runs on two schedules. In November 2024, 97% of arrivals were on time; in July 2024 that fell to 69% — a 28-point seasonal swing. Across the full period the route averages 84% on-time against a national 78%. Morning departures also hold up better than evening ones (94% vs 58%), which matters most in the rough months.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 9 min
- completed flights
- Cancelled
- 0.2%
- Flights/day
- 1.2
- last 12 months
- Duration
- 1h 48m
- scheduled
- Distance
- 554 mi
Monthly on-time trend
Best time to fly from PIT to STL
Aim for departures around 7 a.m. (98% on-time); avoid 8 p.m. departures (47%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 6 min |
| Tuesdaybest | 91% | 4 min |
| Wednesday | 89% | 5 min |
| Thursday | 83% | 10 min |
| Friday | 85% | 12 min |
| Saturday | 88% | 5 min |
| Sunday | 73% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft72%
- Airline operations16%
- National airspace system11%
- Weather1%
Frequently asked questions
- How often are flights from PIT to STL delayed?
- 16% of PIT–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 9 minutes.
- What is the best time of day to fly from PIT to STL?
- Departures around 7 a.m. have the best record (98% on-time), while departures around 8 p.m. have the worst (47%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PIT to STL?
- The scheduled PIT–STL flight time averages 1h 48m over 554 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are PIT to STL flights cancelled?
- 0.2% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from PIT to STL?
- July 2024 was the roughest month in this dataset, with only 69% of arrivals on time. The best was November 2024 at 97%. If your dates are flexible, that 28-point gap is worth planning around.
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Based on 835 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.