Pittsburgh (PIT) to Seattle (SEA): On-Time Performance
Data through July 2026
When you fly PIT to SEA matters as much as anything else about the booking: the route swung from 96% on-time in November 2024 to just 41% in December 2025. Across the full period the route averages 75% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 69%), which matters most in the rough months.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.5%
- Flights/day
- 1.3
- last 12 months
- Duration
- 5h 22m
- scheduled
- Distance
- 2,125 mi
Monthly on-time trend
Best time to fly from PIT to SEA
Aim for departures around 7 a.m. (90% on-time); avoid 7 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 15 min |
| Tuesday | 79% | 10 min |
| Wednesdaybest | 84% | 9 min |
| Thursday | 69% | 17 min |
| Friday | 74% | 14 min |
| Saturday | 74% | 17 min |
| Sunday | 69% | 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 aircraft51%
- Airline operations17%
- National airspace system25%
- Weather5%
- Security2%
Frequently asked questions
- How often are flights from PIT to SEA delayed?
- 25% of PIT–SEA 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 15 minutes.
- What is the best time of day to fly from PIT to SEA?
- Departures around 7 a.m. have the best record (90% on-time), while departures around 7 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PIT to SEA?
- The scheduled PIT–SEA flight time averages 5h 22m over 2,125 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are PIT to SEA flights cancelled?
- 1.5% 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 PIT to SEA?
- December 2025 was the roughest month in this dataset, with only 41% of arrivals on time. The best was November 2024 at 96%. If your dates are flexible, that 55-point gap is worth planning around.
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Based on 999 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.