Houston (IAH) to Pittsburgh (PIT): On-Time Performance
Data through July 2026
Houston (IAH) to Pittsburgh (PIT) effectively runs on two schedules. In February 2026, 95% of arrivals were on time; in July 2025 that fell to 56% — a 39-point seasonal swing. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 75%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 2.1
- last 12 months
- Duration
- 2h 51m
- scheduled
- Distance
- 1,117 mi
Best airline from IAH to PIT
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Spirit Airlinesmost reliable | 84% | 9 min | 12.7% | 63 |
| United Airlines | 80% | 14 min | 0.6% | 1,409 |
Monthly on-time trend
Best time to fly from IAH to PIT
Aim for departures around 7 a.m. (90% on-time); avoid 8 p.m. departures (73%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 20 min |
| Tuesdaybest | 83% | 12 min |
| Wednesday | 83% | 11 min |
| Thursday | 77% | 15 min |
| Friday | 79% | 14 min |
| Saturday | 81% | 14 min |
| Sunday | 77% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft52%
- Airline operations32%
- National airspace system12%
- Weather5%
Frequently asked questions
- How often are flights from IAH to PIT delayed?
- 20% of IAH–PIT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from IAH to PIT?
- Spirit Airlines has the best on-time record on this route at 84%, based on 63 flights. 2 airlines flew IAH–PIT frequently enough to compare in this period.
- What is the best time of day to fly from IAH to PIT?
- Departures around 7 a.m. have the best record (90% on-time), while departures around 8 p.m. have the worst (73%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAH to PIT?
- The scheduled IAH–PIT flight time averages 2h 51m over 1,117 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are IAH to PIT flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from IAH to PIT?
- July 2025 was the roughest month in this dataset, with only 56% of arrivals on time. The best was February 2026 at 95%. If your dates are flexible, that 39-point gap is worth planning around.
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Based on 1,482 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.