St. Louis (STL) to Pittsburgh (PIT): On-Time Performance
Data through May 2026
When you fly STL to PIT matters as much as anything else about the booking: the route swung from 97% on-time in October 2024 to just 65% in June 2025. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 70%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 1.2
- last 12 months
- Duration
- 1h 36m
- scheduled
- Distance
- 554 mi
Monthly on-time trend
Best time to fly from STL to PIT
Aim for departures around 8 a.m. (89% on-time); avoid 8 p.m. departures (44%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 13 min |
| Tuesdaybest | 85% | 11 min |
| Wednesday | 85% | 8 min |
| Thursday | 84% | 10 min |
| Friday | 80% | 11 min |
| Saturday | 77% | 16 min |
| Sunday | 75% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft63%
- Airline operations31%
- National airspace system5%
- Weather1%
Frequently asked questions
- How often are flights from STL to PIT delayed?
- 20% of STL–PIT 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 12 minutes.
- What is the best time of day to fly from STL to PIT?
- Departures around 8 a.m. have the best record (89% on-time), while departures around 8 p.m. have the worst (44%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to PIT?
- The scheduled STL–PIT flight time averages 1h 36m over 554 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are STL to PIT flights cancelled?
- 0.4% 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 STL to PIT?
- June 2025 was the roughest month in this dataset, with only 65% of arrivals on time. The best was October 2024 at 97%. If your dates are flexible, that 32-point gap is worth planning around.
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Based on 836 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.