Washington (IAD) to Pittsburgh (PIT): On-Time Performance
Data through May 2026
Washington (IAD) to Pittsburgh (PIT) effectively runs on two schedules. In November 2024, 95% of arrivals were on time; in August 2024 that fell to 64% — a 31-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 (93% vs 80%), which matters most in the rough months.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 1.5%
- Flights/day
- 3.5
- last 12 months
- Duration
- 1h 6m
- scheduled
- Distance
- 182 mi
Best airline from IAD to PIT
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 85% | 11 min | 0.8% | 494 |
| Republic Airways | 83% | 13 min | 1.7% | 1,575 |
Monthly on-time trend
Best time to fly from IAD to PIT
Aim for departures around 8 a.m. (93% on-time); avoid 3 p.m. departures (76%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 11 min |
| Tuesdaybest | 86% | 9 min |
| Wednesday | 85% | 12 min |
| Thursday | 86% | 11 min |
| Friday | 83% | 13 min |
| Saturday | 85% | 9 min |
| Sunday | 78% | 21 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations32%
- National airspace system17%
- Weather7%
Frequently asked questions
- How often are flights from IAD to PIT delayed?
- 16% of IAD–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.
- Which airline is most reliable from IAD to PIT?
- United Airlines has the best on-time record on this route at 85%, based on 494 flights. 2 airlines flew IAD–PIT frequently enough to compare in this period.
- What is the best time of day to fly from IAD to PIT?
- Departures around 8 a.m. have the best record (93% on-time), while departures around 3 p.m. have the worst (76%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to PIT?
- The scheduled IAD–PIT flight time averages 1h 6m over 182 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are IAD to PIT flights cancelled?
- 1.5% 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 IAD to PIT?
- August 2024 was the roughest month in this dataset, with only 64% of arrivals on time. The best was November 2024 at 95%. If your dates are flexible, that 31-point gap is worth planning around.
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Based on 2,069 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.